Heres My Plan Temporada 1 Episódio 4

After So Hyun finds out the truth about Jae Young, she regrets what she has done to everyone, but it was too late to take it back. She goes back to Yu Mi to spit her anger out at her. However, she starts to think that she was the only problem, not the people around her. Therefore, she decides to disappear and leave them alone.