Yeonjun had a habit of gaslighting you into thinking that you don't need anyone else except him. He slowly shut you out from everyone else, even your own parents, until he was the only one in your life.

"Baby, you don't need friends," he said in a matter-of-fact tone, walking towards you as he locked the door of your bedroom, snaking up his arms around your waist. "You have me," he shrugged, pulling you closer.

He wants you all to himself, and he's willing to do anything to achieve that. Anything.