My Girlfriend's Junior Is Trying to Break Through My Impenetrable Defenses!

A new junior student named Chen Yu joined the lab, and from the day he arrived, he's been sticking to my girlfriend Su Wan like a leech. Su Wan clearly told him she's taken, but instead of toning down, he's acting like he wants to be my "male best friend." I saw him once at a dinner party; he's got rosy lips and white teeth, and dimples when he smiles—quite handsome. But all his attention is on Su Wan; he barely even bothers to say a word to me, his boyfriend. That night, Su Wan and I were snuggled in bed watching a movie when our WeChat video call suddenly rang. The screen lit up...