Help me find this manhwa please
I think it’s a bl? I forgot but it could be a romance also.
So basically mc is working at a pc cafe and a customer asked them to pause their time because they wanted to go to the bathroom. Mc had to sign up for their classes for the semester ( it’s college) and because it was almost time to sign up for the semester they paused the timing of the wrong persons. Who coincidentally was also signing up for classes. And they went to the counter mad yada yada you get the gist
They ended up in the same class
Please help me find this manhwa!!
The uke had a child with the ml but the ml doesn’t know. Ml has black / dark blue? Hair and the author has another work that’s completed.
There was a scene with uke and seme on a bench in the park? And seme found out about the kid after leaving uke for so many years. I can’t remember!!

I can’t rmb much about it but it’s a bl and the mc plays the piano? Or something but need therapy or sum. The the ml does something and its with like no string attached typa shi. Then the mc recovers? And goes overseas but atp he already liked the ml and only when the mc left then the ml realised that he liked the mc
Honestly I don’t even know if half of what I’m saying true but I’m confident in the Mc leaving the ml part
It’s not really a ‘regretting’ arc because idt the ml did anything bad
haven't read much to know if it has the the -regretting- plot line ... but maybe this is 'Ebony Castle'