Okay so I don't know if I'm exactly right but I feel like what happened is when sahee gave sebin the crush bracelet one of the twins threw it away because they like sebin so the whole situation has been misinterpreted because sahee and sebin have mutual feelings for each other since middle school.
Ahh I hope more chapters are released soon im so hooked on this Manhwa! its amazing I feel so bad for the children at such young age they had to experience so much.
AHAHA they're so cute