Sejin contributed to that big time in the past. Before Ido had treated him harshly in the past, Ido learned to love him first. Love that Sejin can’t fully trust since it is something that bloomed just recently. So with his father’s manipulation Sejin chose his family more than Ido and betrayed him. Ido begged Sejin for an explanation but he didn’t give him one. Ido thought Sejin never really loved him so Ido start treating Sejin harshly. That was the first misunderstanding. The second misunderstanding was when Ido’s brother came by the house and saw Sejin in heat and r@ped him. Sejin run away after because he thought that Ido gifted him to his brother. When Ido found Sejin he thought Sejin and his brother were having an affair which Sejin didn’t cleared up and used it to provoke Ido.
The first timeline was full of messy misunderstandings.
i love this story and how the author makes it a bit unsettling bc we're going thru all these new experiences with sejin while it seems like everyone knew what was going to happen
spoiler //
this is their second life and only ido remembers what happen the first time around. this time he's repenting for his past sins and how he treated/other people treated sejin. according to the novel sejin ends up remembering his first life and it hurts before it gets better