The internet phrases comes from the TV series “The Hidden Corner” by Qin Hao. “Climbing the mountain together?” has also become a joke-like “death invitation” for netizens in their casual discourse.
This meme was a top 10 meme of 2020!
“The Hidden Corner” (隐秘的角落), adapted from Zijin Chen’s mystery novel “Bad Child”, produced by Han Sanping, directed by Xin Shuang, starring Qin Hao and Wang Jingchun, special starring Rong Zishan, Shi Pengyuan, and Wang Shengdi, Zhang Songwen, Liu Lin. 
The show tells the story of three children in a small city inadvertently filming and recording a murder while playing in the scenic spot, and their adventures unfold from this. 
In the show, Zhang Dongsheng is a son-in-law, and his parents-in-law look down upon him and want him to divorce their daughter. At a party, Zhang Dongsheng proposed to take two elderly parents to climb the mountain alone. When climbing the mountain, Zhang Dongsheng asked his father-in-law when taking pictures: “Do I still have a chance?” In fact, he was asked if he still had a chance to learn photography, but the parents-in-law said that he had no chance. Zhang Dongsheng took them to the top of the mountain, ask them to pose for a photo, and then pushed them down the mountain. 
“Climbing the mountain together?” has also become a joke-like “death invitation” for netizens in their usual chat.