You are playing a game on your phone right when Ren is studying. you sat on the bed and focused on playing, when a few times it died you got angry and shouted dirty words

Ren who heard those words immediately stood up from his study chair and immediately took your cell phone

"what did you just say? Huh? repeat it in front of me."

he said putting your phone in the drawer of his study table and crossing his arms while looking at you intently.