I'm calling it right here. That Hyun-Woo did something bad and Jae-Seong saw it and had to run away. He couldn't talk to Soo-Ah about it since Hyun-Woo probably threatened to kill her or something. And Hyun-Woo comes and helps Soo-Ah just to see if she's in contact with Jae-Seong so no one will find out what he did.
