
I Indonesian, Indonesian translate from novel. Please read knowing spoiler. My English sorry. Not good. But understand I think?

What!!! Claude tries to kill Athy? But why? You said that Felix showed him everything- like the gardens, library etc. And why didn't Felix try to stop him? And why does she teleport to the Alpheus house? Nothing makes sense. Well atleast Claude gets his memories back. But still I don't understand why he tries to kill her when people actually show him evidence that he used to love Athy like hell... Just my personal opinion tho...

Hi. I am writer of spoiler above.
Sorry not know of English version novel. Maybe? Maybe not? I know not sorry. Original novel is Korean, that I know.
In original novel, day of 18th birthday of Athy when Claude kill Athy for poison to Jenette.
Yes Athy with Lucas. Living with Claude also as reunion of Athy and Claude happens.
Actually showing evidence reason why Claude tries to kill Athy that way. He say Athy never see him again. But Lucas show him all the evidence. Also cannot forget expression on Athy face when he not recognise her when he wake, also her expression at feast on his birthday enjoyment. Now he confused. Emotions he can't bear. He just want suffering to end, and not sleeping for weeks, finally thinks maybe if Athy dies, then he get peace. So try to kill her.

Actually you must understand, unlike webtoon, in novel, many chapters from Claude POV ie through Claude eyes.
Eg. Reason Claude not kill Athy- Claude thinks Athy stupid that she comes to him smiling brightly when he has thought of death her. But she also think Athy clever and see his intentions, because several time she also scared of him and angering him. Sometimes she act bold. Then immediately act submissively. Claude thinks funny. So when young Athy comes, he says to himself "today I kill her for sure" but he spends time with Athy, then Athy leaves, he says "okay I let her live today but tomorrow I kill her". But same thing happen tomorrow. This "I'll kill her today I'll kill her tomorrow" goes on till that day when Athy spits blood and Lucas saves her. That day he thinks " okay now I don't have to kill her she'll die by herself. I simply do nothing" but he touches Athy and realises mana is the problem. He remembers Diana die same reason, too much mana. He thinks "her magic kill Diana now kill her too" but again he not understand that he get angry at everyone who cannot save her. He tries to kill Blacky. Actually Lucas in novel says only few people in many centuries have divine animal. So Claude not recongise it. Lucas says Claude it only a magical pet which can help athy. As Lucas knows no-one in present world has even heard of divine animals (Lucas had divine animal when young and sad when it disappeared, so tells Athy she stupid for liking blacky because he liked his divine animal and also he never eats blackie). After Lucas heal Athy, Claude realises he not want her dead anymore. But he also curses the emotions he feel cause Claude beginning from young age emotionally unstable because of neglect and mistreatment.
Also the day Claude make Athy sing lullaby, Claude actually only pretend to sleep. Claude is surprised when Athy pulls his hair but his magic protection not hurt her. Also when Athy slap Claude cheek, again magic protection not activate. Also Claude hears talk between Athy and Felix about mothers and only starting that day he show Diana memories in Athy sleep. But in webtoon, not shown these things.
When Athy say "I don't need mama because Athy have papa" Claude hurts because Diana said same thing to Claude " even if I not there, Athy has you", Diana ask Claude to love Athy more than Claude love Diana, because Diana think I cannot stay with Claude, but maybe Athy can. So give Athy immortality name. Moral of story is Claude name means cripple and actually name suits Claude.

When Claude see Athy first time, Athy five years age, his first thought "looks like Diana". As Athy grows up, Claude realises "looks like Diana, talks like Diana, does things like Diana, what is happening. Why Diana not just die. Instead she leave carbon copy exactly to haunt and insult him, and remind him of her death". Claude says okay i give her chocolate and cake, force her to eat, she become fat and stop look like Diana anymore. But Athy eat eat eat happily and not become fat. Instead looks slim like Diana. Claude not know why this happening. Angry that Athy not becoming fat. So finally just starts saying you're fat, chubby cheeks because Athy not becoming fat as Claude wants. Even people who like Diana -Fellix and Lilly also like Athy and say that Athy is just like Diana. He thinks he likes Athy because Athy is like Diana. But day of dance, Athy keeps stepping on Claude feet, that Claude laughs. Maybe similar to Diana but is not Diana. Because Diana means dancer and here Athy can't dance. He realised he likes Athy not as Diana but as Athy, his daughter.

Hai, boleh tau kamu baca novelnya dimana?

Y'all misunderstand caus y'all too stupid to get stuff when they r presented in front o u...!:D

I take it back...@-@
My English bad, still I try to say what happened.
Claude loses his memory and does not recognise Athy standing near bed when he wakes. He surprised that his magic not kill her. He so much more surprised when Fellix say that Athy is his daughter. I can't believe, still I don't know why, I don't kill her, only send her saying never see me again. Then Fellix shows him garden and library he made for Athy, he questioned gaurd at library and even they say the library is his library for her. He shows me drawings of Athy that are stuck inside my sleeping bed and claims that I stuck them. Then he shows a painting of me and Athy where my eyes look happy. I can't understand it. I come to conclusion that Athy is witch who used her black magic to fool everyone. But her magic have not work on me. No. I'm much too skilled to fall into her traps. Still, why then can't I sleep. Why I see and remember Diana, who say I should love our child more than I love her. Though this is black magic, why can't reverse her black magic.
Finally a feast for my birthday. One by one people come greet me and one by one they ask where Athy is. Claude decide to expose Athy that her magic has not worked on him. He calls Athy to feast. There he accuses her of her black magic, tells her it has not worked on him, says if she doesn't reverse, he kill her certainly there itself. Athy say nothing. Only tears silently come out of her eyes. His heart break seeing Athy cry. He has killed mountains of corpse bodies. He feel nothing when people close betray him and beg with tears to let them live. He kill them all. But why his heart pain when Athy who he never before seen, has made tears. He can't understand why he has this emotion. Maybe her magic has also affected him afterall. Athy only turns and walks out. He wants to tell gaurds to kill her/ stop her but some reason, he not able to do it. He sees the shock on face of people around him. He decides to kill them all for making such shocked faces. he turns to give order to fellix, but before he can, he sees fellix face. Disgust and full of disgust to him. He freezes. Fellix loyal since children they were. But he likes her more than him. Like Diana. Like everyone. He hated all his family members, because he better than them, still they above him. They cause him only sadness. Now she has taken away two people who love him. He not forgive her. He will kill every person with his gemlike blue eyes. He will be only remaining person in his family. Every person in his family is evil to core. He leaves. Still he can't sleep. If she only deception black magic to fool, why he can't sleep. Nightmares. He scared if he sleeps he see them.
Athy stop eating. Stop reading stop going out. All maids worried. More worried lily. Lily say go walk, but Athy say no. Then seeing lily cry, Athy say ok. I'll walk. Athy goes to walk but alone. She goes to rose garden. Finally she comes to white roses of garden. She remember Claude made red rose gardens when Athy happen to say she likes roses. But one day, when she walk with Claude, she see one white rose and she say beautiful, and Claude cuts half red roses next day and orders a white rose garden as well. Actually she likes red roses and white roses equally same, but still this white rose garden her favourite because of what Claude did for her. But now she hates the roses. She starts plucking and throwing all roses on ground. Suddenly she realise someone watching her. Claude. He tries to grab her neck but something stops the hand. He says definitely, no-one can fool that it is his own magic that protects Athy. But if his magic, that only means he can also break it. He starts. But the magic so strong that there are hundreds of different spells around her and all are attacking him when he tries to kill her. His own magic against him. And taking too long. Cuts his arm and he bleeds badly. Athy doesn't move blaming herself- she should not have touched blackyy like Lucas say, but she ignore Lucas, now this her punishment. But she think also Claude's fault also. Why he risk his life to save her. Actually all his fault. He should let her die then. But no save her then. Now kill her? She won't allow. The moment claude destroy last spell protecting Athy, Athy remember what Lucas say "one day blackky will go inside her and she be able to use magic". She decides she not die but telelport like Lucas telelport her to Whitey's house. She also telelport saying "goodbye papa". Claude shocked. She goes whitey house. Jenette, isekeel. Then goes to mage school to learn magic and finds that she strong just like Lucas used to say. Lucas also returns. Finally 15th birthday gift Lucas gives Athy, that he hits Claude on the head with wand and Claude remembers Athy, also past Athy who he kill manipulated by Jenette and jenette dad (his own brother). He search Athy. Athy thinks to kill her and so runs but soon return to claude. Reunion there is. Lucas Athy fall in love.isekeel asks Athy to marry but Athy says no, I see you as brother/ friend not lover. And he has to go to Jenette, but Jenette know he loves her not, loves truly Athy.
Then finally 18th birthday, in novel day Athy die, in real life, Claude say Athy successor to him and will take throne.