Spoiler below

Read the raws and can't help feeling so goddamn annoyed about the uke. The love triangle in season 2 was goddamn unnecessary. That was a mess, I hated every bit of it.

SPOILER!!!!!! IT'S GOING TO BE LONG.
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The cover is actually for season 2 and things are going to go down from there. Minwoo and Yujin did get together in season 1 after all the drama. From my understanding, because I can't read Korean, Yujin can't be with a human because mermans are supposed to marry their own kind and being with Minwoo only puts a toll on him. But he is really interested in Minwoo. At first, I don't think he was in love with Minwoo but it gradually developed overtime and they started dating. Yada yada, now in season 2, we are introduced to the second guy that is Minwoo's co-worker or perhaps manager in a coffee shop? That sparked jealousy on Yujin. Then after a few chapters, we are again introduced to another character, a woman, and she was supposed to be Yujin's partner. She is a mermaid but Yujin didn't want to be married with her. She was acrually the one who cursed Yujin because he chose a human over her. Out of jealousy and contempt, she met with Minwoo and gave him a ring. Now stupid Minwoo wore the ring, I didn't understand what the woman said that made Minwoo wear it but he still did. And the ring made him forget all the memories of Yujin. Things went wild, Yujin tried to make Minwoo remember that they are lovers (it's kinda anticlimactic that the only way Yujin does to make Minwoo remember is through sex, altho he did try to be sweet a lot) but every time Minwoo remembers his head only aches due to the curse of the ring. It only made him remember the bitter past of them together which happened in season 1. Yada yada, Minwoo started avoiding Yujin and Minwoo started getting close to the second guy. Yujin and Minwoo fought a lot (there was also a chapter when Yujin just felt so hurt that he tried to force himself on Minwoo and it just scared Minwoo and avoided him more) and one chapter Yujin saw Minwoo and the second guy kissing in front of the coffee shop. Yujin punched the dude, Minwoo tried to stop them only to stumble down and hurt himself. He ran away from him and the second dude followed him and asked him to just stay in his house for now. During that night, second dude heard Minwoo crying so much and then dude comforted him and kissed him and slept beside him (not sex, just literally slept). After that Minwoo was confused and kept blushing whenever he sees the dude. He then went on a date with this dude and what not and decided to.move out from Yujin's place. Yujin begged him so much not to leave. He even cried. Minwoo started to remember fragments of good memories of Yujin but the ring was preventing him from actually remembering that and then both just went and had sex. Everything is just sex in both seasons, by the way. Now Minwoo apologized to the second dude about what happened (note; the ring is still in effect but he decided to just stay with Yujin). Yada yada, Yujin talked to the woman and begged her to remove the spell from Minwoo. After that she gave him a pendant to remove the ring and Yujin used that. Surge of memories came back to Minwoo and he passed out. When he woke up he kept crying and apologized to Yujin for forgetting all of that and then sex again. That's all. That's.... the atrocity that is season 2.....