need help finding a manhwa

I've been tweaking out trying to find this fucking man manhwa. The MC has red-ish hair and is older than ML, who is really short and has black hair. ML plays baseball too and is a first year. They become friends after meeting at the train station (where the ML was wearing school clothes sizes big on him and says its because he'll 'grow into them'), and sometimes hang out at school. They make some sort of promise that the black haired guy would grow taller than the red haired guy, which does happen by the way. Thats all I remember and it was super cute and fluff. gang help