Su Jin heard Yu Haiyang's words and quickly asked him to sit down. If Yu Haiyang went out now, he would never be able to turn things around. However, if these people forced their way in, Su Jin could still call the police or fight back. After all, they would be breaking and entering and it's Su Jin's right to fight back.
Su Jin comforted Yu Haiyang, "Don't be impulsive. If you act impulsively now, you'll never be able to turn things around!"
"These people are trying to provoke you into doing something that you'd regret. And then they would use that against you. We'll have very little defense then!"
Yu Haiyang heard this and knew that Su Jin was right. However, he clenched his fists as he was reluctant to let these people cause trouble here. He unclenched his fists when he saw his mother's worried look. It took a lot for him to be bailed out finally, so he mustn't act impulsively now and worry his mother again.