Since when were they an item Σ( ￣□￣||), did I miss something

Just found out: chapter 171 is when they fooled that guy who's into her into thnking they were dating. Chapter 172 is when she told Jiwoo she wouldn't date that guy if he had a problem with it. So either she's teasing him this chapter or they made it official off-screen.

Oooo thank u , her face did not looked like she was teasing him ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄