Spoiler

So based from a bit of what I can understand from the MTL of the raws, the ML(Tae Sung) ignores MC(Woo Young) for a long time even though the MC tried to fix their relationship to how it was before times and times again. It was only when they graduated from high school that ML start to feel sorry and attempts to apologize for all his wrongdoings towards MC and beg for them to return to how their relationship was before all this drama happens. But it is too late and at that point MC is already so broken hearted so he decided to enlist in the military which he is going next week at that point of the story. MC here is trying to get away from ML by cutting off all contact and enlisting in the army in order to forget about his feelings for ML.
Sigh facepalm*. The one who suffered the most between these two clown in love will be innocent Soohwa at the of the day. So many angst and honestly the ML attitudes make me disgusted because he ignores every single attempts that MC make to try and communicate with him until they graduated and then acts like he is the victim like gurll nani the fuck!!?? (╯°Д °)╯╧╧