I'm looking for a webtoon that I believe is Korean. The first couple of chapters deal with a male and female who are best friends. The female is away at university and she takes a phone call of his. She has black hair and I believe the guy is in love with her and gets jealous when another guy touches her...If you need more info, let me know.

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I'll take today over yesterday, anyday
I'll take lyin' in your arms tonight
Over and above any love, I've known
Memories may find me, but they'll always be behind me
I'll take today over yesterday, anyday
- Gary Allan -

Your description is very vague but maybe..
Our Relationship Is...