
[SPOILERS]
Jesus man that's scary. I can't read Korean so I only assumed. No, he did not commit suicide.
1. The next chapter is a flashback about a younger Chiwoo and Jihyun, how they met, became friends, and etc. It's really melancholic to look at. They really used to had it going pretty well in the past. It so sad how things turned out right now.
2. Jihyun visits Chiwoon, kneels and I assumed, he was deeply apologizing. I think Chiwoo forgave him but probably also told him that he he can't keep doing this anymore. I'm not sure but that's what it felt like since Jihyun is really crying and so is Chiwoo.
3. It seemed that Jihyun finally gives up on Chiwoo. When Chiwoo was leaving the hospital in a cab, Jihyun texted him some stuff and when Chiwoo looks back, Jihyun is there. It seemed that they were saying their last farewells.
3. Chiwoo is collecting all the photos he had with Jihyun (they really looked happy together in one of the photos, it's kinda sad). He put them in the box and left them in the curb near the trashes. He's ready to forget Jihyun T-T
4. The last chapter is Chiwoo meeting Kyujin and the panels show Chiwoo tiptoe kiss Kyujin, surprising Kyujin since Chiwoo doesn't usually initiate this stuff. The last panel is showing Chiwoo finally happily smiling T-T
https://toonkor.lat/%EB%B3%B5%ED%95%99%EC%83%9D_45%ED%99%94_%EC%B5%9C%EC%A2%85%ED%99%94.html
Oh my gosh you guys. I checked the raws and the ending T-T