"Climb the mountain together" means "send you to death". In the first episode of "secret corner", the hero Zhang Dongsheng takes his father-in-law and mother-in-law to climb the mountain and pushes his father-in-law and mother-in-law down the mountain in the name of helping to adjust his posture and take photos. This stem is sometimes used to express refusal. "Climb the mountain together" is also used to express "do you want to die", and refuse other people's requests when making jokes.
In the TV series "secret corner", Zhang Dongsheng's wife cheated in marriage and has been arguing for divorce. Her father-in-law and mother-in-law support her daughter's divorce very much. Another point is that Zhang Dongsheng is a door-to-door son-in-law. In order to leave his hometown with his wife, he did a good job of property identification when he got married. If Zhang Dongsheng divorced, it means that Zhang Dongsheng had to clean himself out of the house.
In order to save his marriage and not let himself lose everything, Zhang Dongsheng took his father-in-law and mother-in-law to the mountain by climbing with his father-in-law and mother-in-law. One second ago, he respectfully took care of his mother-in-law's drinking water and considerate good son-in-law. The next second, he pushed his father-in-law and mother-in-law down the mountain without any sign or premonition.