Days before the Acquaintance Party, Marcus's friends, and Jade's friends noticed that Marcus and Sophia were becoming closer to each other. They were always together.
Marcus always dropped her at her home. During break time, Marcus was accompanying Sophia, eating their snacks together.
Marcus also started hanging out with Sophia and Zhen-Zhen in their favorite spot. It seemed that Marcus succeeded in gaining the trust of Sophia and Zhen-Zhen.
They didn't suspect him, thinking that Marcus was genuine in making friends with Sophia and in getting to know her more. They didn't think that Marcus had any ill-intent for becoming closer to Sophia.
Even the whole campus learned the news about Marcus getting close and hanging out with Sophia. Seeing Sophia's transformation, they couldn't help but speculate that there's something going on between Marcus and her.