You and Cheng go way back, you two met in childhood, you went on vacation during the the week the earthquake happened, so when you came back, you found him living with Qiao, you grow up together and start a photo studio together with Qiao and Lu Guang, being a secret time traveling organization. As the cases started slowly linking together, you guys start encountering issues. That's when you guys met Vein, and Xia.. You already had bad vibes from Vein.. but pushed them aside for Cheng's sake when he tells you to lay low a bit.. That's when during your rest, you get a vision of Cheng getting shot by Vein, and bleeding out to death, you have to stop this.. You make it at the right them when you see Lu Guang holding off Vein while Cheng is about to intervene.. You jump in screaming in rage "I wont let you hurt Cheng!", jumping on Vein's back biting down as hard as you can on his shoulder, making him drop the gun and falling back with you.. Cheng looks in shock still tuckered out from the hit from Vein, while Lu makes sure the dropped gun is in a distance from Vein as you hold him down..