Mu Liang didn't need to guess what had happened. He searched in the CCTV footage of the shopping mall and found out that Li Sheng was in the same place while Mu Lan and the others were shopping. That's how, Li Sheng saw Mu Lan and made this devilish plan.
Li Sheng never thought of hiding his trail because he had never dreamt that someone so powerful would back Mu Lan. So Hugo easily got every information they needed.
At that time, if anyone was to see Mu Liang's expression, they would surely wet their pants.
Mu Liang didn't touch a single hair of Li Sheng and his secretary. He sent a man from Mu Feng's A team to China.
Mu Liang had every authority to order Mu Feng's teams and rule the underworld without Mu Feng's presence. At that time, Mu Feng was busy with Qi Ying's issue. So Mu Liang didn't tell him anything. He knew that Mu Feng would find out everything eventually.