Metropolis: Who Made My Sister Unhappy?

Li Feng, who returned to the city after cultivating immortality, transformed into a maniac who loves his sister. "Nothing is important in this world. The most important thing is that my sister is happy." "My greatest happiness in this life is to make my sister happy." "Whoever makes my sister unhappy for a moment will be unhappy for a lifetime." "My sister can do whatever she wants, as long as she's happy." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.