Sean Xiao's strongest right hand comes from the fifth season of "Detective Star", in which Sean Xiao plays Xiao Sa. Because he lost his left hand in an accident, he had to rely on his right hand to do things, so he said his hand was the strongest right hand at that time.

Xiao Sa is a train attendant, and Sa Beining plays the detective conductor. In the play, after Xiao Sa said that his hand was the strongest right hand, the conductor interrupted him and asked "How long have you been single", which led the topic to the direction of the local mystery, so the "strongest right hand" became a stalk.

The case of the northern slow train riddle in Detective Star:

At first, the car king of the northern slow train riddle was Jia Liu (Haoran Liu), and later he became the conductor and Jia Yun (Ruoyun Zhang). The change of each person's role is also related. However, the connection of this series of stories is related to five teenagers in the courtyard near the railway and ghosts (Emma Wu).

One of the notebooks that can be crossed is precisely because of this notebook that the II and III cases appeared. And the person who used this notebook is Xiao Sa, five teenagers in the yard near the railway, and the other four people are very fond of ghosts. In the first time, Xiao Sa loved ghosts, but ghosts were with Jia Liu, and finally they were killed by Hao Chen's poisoned milk.

In the second case, it was a result that Xiao Sa used this notebook to cross. He reported Hao Chen and tried to stop him from harming ghosts, but Hao Chen escaped, so Xiao Sa wanted to kill Hao Chen and protect his girlfriend from ghosts. Therefore, the murderer in II was Sean Xiao, but the detective driver made a mistake and finally failed to report.