World-hopping with my enemy!!

Li Huan and Zhao Fang have been enemies since their first year in college. Both of them are continuously arguing with each other making their classmates have no peace in their classroom. One day, on their way to their trip, their bus crashes against a wall and then the next thing both of them see is a little ghost named Odin. Odin is the system of companionship, who is assigned to them by the higher-ups. due to the turn in events, both Li Huan and Zhao Fang have to force themselves to work together if they ever want to return back to their world.