Leave Sejin alone y'all!! He just wanted to be loved why all of them are so cruel??! He's the sweetest boy why can't y'all love him? In the past, Ido beat him, humiliate and throw him away. In the present his dad slapped, humiliate and throw him away. No matter what he chose, the result will be the same. The only one who truly cares for Sejin is Mr. Kim. Ido only cares about Sejin after the tragedy happened in the past. If the tragedy didn't occurred, Ido probably still treating Sejin like shit until he grew old. I just want Sejin to be happy on his own. Not with his dad or Ido. Tbh I ship him with Mr.Kim but Sejin looked at Mr.Kim as his caretaker, nanny, secretary or more like big brother figure.
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