The plot is on a post apocalyptic Earth where humans survive by building an underground city. Humans were on a war with Aliens so the Earth became unlivable on the ground. A couple who grew up together were soon separated by the Top/ML getting killed on a mission he was sent to over the ground. His colleague brought back only his uniform to the lover, MC. The bottom or MC was a scientist and while trying to build a machine for traveling to a different dimension, an rmed force lead by a man looking similar to his dead lover, shows up. He finds out that person also had a lover who looked like MC and died from cancer on that parallel universe.
The plot is on a post apocalyptic Earth where humans survive by building an underground city. Humans were on a war with Aliens so the Earth became unlivable on the ground. A couple who grew up together were soon separated by the Top/ML getting killed on a mission he was sent to over the ground. His colleague brought back only his uniform to the lover, MC. The bottom or MC was a scientist and while trying to build a machine for traveling to a different dimension, an rmed force lead by a man looking similar to his dead lover, shows up. He finds out that person also had a lover who looked like MC and died from cancer on that parallel universe.