1.not just some memories he remembers everything
2. Ido loves him but clouded with lies by his brother, and Sejin really did fvck his company a lil bit by his father's order so they become distant, still ido loves him. this is why on the present life his brother is missing Ido took care of him ahead of time.
3. any more than this i will spoil the fun for you but great speculations , i just said the facts where the events already happened.
we are slowly getting into the angst part of the story.
there's no spoiler tag on replies but i hope mangago wont cut my comment, if this goes through please dont click my comment its a spoiler
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No Ido didn't shot him with the gun, Sejin killed himself with Ido's gun.. Sejin got pregnant but Ido's brother told Ido that it was him that got Sejin pregnant because he raped him multiple times, Ido being a stupid that he is almost believed his brother, Still in love with Sejin he confined Sejin at their house, when in fact the baby Sejin was carrying is Ido's child. Ido realized this a little too late he found Sejin's body with his gun beside him..
Sorry if my explanation is messy im driving lol, i tend to forget things so might as well reply while stuck on moderate traffic.
With the clues we've got so far:
1. This is their second life. Ido has some recollection of the past life. Sejin is unaware, but his subconscious knows.
2. They were partners in their past life, Ido seemingly distant, possibly abusive/hostile to some degree? Sejin's family situation was even more rocky. They weren't happy.
3. ... Did Ido shoot Sejin????? Is that why the gun is mentioned???????? It needs to be fired now that it was mentioned, but maybe it already has been fired..?
... Or Sejin did shoot himself? My bets are on that.
Ido then had enough regrets to get a second chance