Actually, Su Chengyu didn't want to get involved in this mess. If the man were simply Xu Lingshan's enemy seeking revenge, Su Chengyu would definitely not intervene.
But as soon as he arrived, he found four dead bodies on the ground, one of which was a waiter in the restaurant. Su Chengyu couldn't ignore such indiscriminate killing of innocents once he had witnessed it.
"Mr. Su, don't interfere, he's my enemy, very formidable, you're no match for him!"
Xu Lingshan was scared that Su Chengyu would also be killed by Yan Tong. He knew that Su Chengyu was a miraculous doctor, but he had no idea that Su Chengyu was far beyond just medical skills.
"Whether I'm a match for him or not, we won't know until we fight."
Su Chengyu strode forward. Yan Tong sneered, "Kid, since you're courting death, I'll grant your wish. Remember my name is Yan Tong. When you get to Yama, remember to mention me!"