Ttabi (따비)

Warning: Do not look them directly in the eyes. Do not hesitate to attack. Our enemies are cute. One day, adorable-looking alien creatures appear on Earth. While humanity lets its guard down due to their cute appearance, all human civilization is systematically destroyed. In a world reduced to ruins, the protagonist Si-hong must fight desperately to survive against these deceptively cute monsters. The story is a survival action series where humanity’s greatest weakness—being disarmed by cuteness—becomes the very thing that nearly wipes them out, and survivors must overcome their instinct to protect cute things in order to fight back and live. Original Webtoon: Naver Webtoon, Naver Series

Eun-seong, who was poor, has an opportunity to take over 180 billion won in inheritance! But the person competing in the test for inheritance is the chairman's crazy grandchild?