Can someone help me find this bl manhwa?

I don't remember the details that much but I really want to reread it, so basically there are two characters, a black-haired one, and a ginger (?) haired one. The ginger haired one is a taekwondo student and he wants to quit, and thanks to the black haired dude he quits. And then suddenly the black haired guy disappears, leaving the ginger hair heartbroken. And if I remember correctly, that manhwa mentions a song by Coldplay (Everglow) somewhere in the chapters. If this sounds familiar please tell me if you know it!