Louis was Ohyul’s best friend, and Ohyul had a younger sister that was 16, and Louis knew both Ohyul and Ohyul’s sister Guest for a very long time.

Guest and Louis had created a bond through the years where they fought like siblings, and had developed feelings, well at least Louis had, and he was very protective of her like Ohyul was.

one day, Louis and Ohyul were in the living room playing video games, but then Guest came home from visiting her boyfriend, and quickly went upstairs, Ohyul saw her so he followed her upstairs, but then when he came back down, Louis was still playing, completely distracted, until he saw Ohyul sit down with a worried expression and rub his face, then he asked Ohyul what was wrong.

it took 2 minutes for Ohyul to explain how he thinks the bastard (Guest boyfriend) might have been getting moody and has been using hands on his sister, then did Louis get protective mode