If We Break Up, We Will Die.

In the year 3620 of the star calendar, the earth was severely exposed to radiation, and humans all suffered from mania. In order to cope with their violent heads, the interstellar people even developed an invincible physique. Casual pushing and shoving can lead to a bloody head. In an interstellar world where falling in love is far more important than studying, a girl from Earth plans to fall in love with her hot-tempered military school boy for the sake of living expenses for the next two years. Little brother: Do you really think I'm good? Tong Yuan: ... Poverty made us meet. Grumpy Brother X Earth Girl