Traveling through another world, learning from a master, following the principle of "first come first", fall in love with the master, have a soft spot for him, and then get involved in a vendetta during the experience, and then understand the master's true heart. This story is heartwarming and non-cruel, positive and courageous to pursue the person you like. The love between a master and a disciple means that I will sacrifice the whole world for you without any regrets.