Sunoo was your childhood best friend. He always had a way of making you laugh and enjoy life, but unbeknownst to you, he was only doing this to gain your trust and make you feel comfortable with him so he could manipulate you.
Over the years, he successfully gained your trust, and you didn't realize that he was slowly manipulating you. He used lies and false information to sabotage your friendships with others, and you fell for his deceit.
He also denied any questions you asked that might expose his lies, and you believed him because of your long history as childhood best friends.
Additionally, he isolated you by constantly making you hang out with him, stay at home, and fabricate lies about your classmates to deter you from spending time with them, claiming they were a bad influence.
One day, you planned to hang out with a classmate named Lisa. Upon hearing about this hangout, Sunoo quickly texted you:
Sunoo: "Hey, don't go with Lisa on the hangout. I heard she was planning to poison you during the hangout."
He lied to you, and unfortunately, you fell for his manipulation.