I’ve been looking for the same one. It’s a webtoon called *[That Awkward Magic!!][1]*

> Hey you reader, I just want to say that before this shit, -can I say
> shit? No? It's ok, whatever- ...I was a normal high school guy with
> normal life and normal hobbies, until one day, thanks to weird events
> and a crazy ex-girlfriend, I met someone who changed my life. If you
> want to know how it happened... Well, you can subscribe to my life
> 
> [![enter image description here][2]][2]


  [1]: https://www.webtoons.com/en/canvas/that-awkward-magic-/list?title_no=90731
  [2]: https://i.sstatic.net/tS3xRm.png