Storm: The Last Mech Standing

DramaBox synopsis

When alien beasts threaten humanity, Baek Kang-min, the only pilot capable of controlling the powerful mech Storm, repels the invasion and becomes a hero. Haunted by his parents' deaths, he disappears and joins Kang Min-seo's Revo Clan under a false identity. Two years later, the largest 5S-rank beast horde ever recorded approaches Earth, forcing humanity to call upon its greatest hero once again.