Why didn't Li Yingjun tell Kim to smile?

Li Yingjun didn't tell Jin Xiaoxiao because he considered the overall situation and family harmony. He didn't want his parents to continue to be frustrated because of this incident, so he chose to pretend to have amnesia and fulfill his brother's idea. If he told Kim to smile, his efforts in the past ten years might have fallen short, so he didn't tell the truth.