You Who Travel Through Time and Space

For the first time, he used an incense burner that came from nowhere to go back in time because of his mother who died of illness and his ex-girlfriend who died because of him. He meets Xiao Yu'er, a seventeen-year-old girl who was kidnapped and managed to escape, and the entanglement between the two arises... As a policeman, he went in and out of various drug lords' dens, just to capture them in one fell swoop and reverse the outcome of his girlfriend's murder... While traveling around with the girl, he also discovered many secrets about her... When he returned to the past for the second time, he also gradually developed feelings for Xiao Yu'er, a girl who had been confessing to him all the time, differently from the first time. The third time he went back to the past... He no longer did it for his ex-girlfriend. The last time he finally went back to the past for her and rescued her unfortunate...