From friends to lovers

Character introduction

Hello? My name is Jeong Yeo-ju, I'm 19 years old. My best friend is Seok-jin. I like Seok-jin, but since we've been friends for 15 years, I can't say it to him.

I'm Kim Seok-jin, 19 years old, and I'm best friends with Jeong Yeo-ju.