Responses
This might be it?
https://www.mangago.me/read-manga/form_of_sympathy/
Noah is rlly remember it wrong, turns out it's not mc's sunbae but mc's former student loll
Thank you so much
Typo *Woah, I
Hxhzjzj
This manhwa set in collage, ml is a famous sunbae that has pretty face with black hair and I think mc is just an ordinary student.
I forgot the entire plot of this manhwa (I'm sorry lol), but I remember in the epilog, sunbae went to military service and when he miss mc he will called out other subordinate that has the same or similar name with mc (I think he just wants to have excuse to say mc's name). They also exchange letters and that's when sunbae told the name story to mc.