He serves as the central character. After a period of studying abroad, he returns to find his home life completely transformed by a sudden remarriage.

Chapter 2 masterfully builds . It is the "accidental" touches and the lingering gazes across the dinner table that carry more weight than any explicit scene. The tension is thick enough to cut with a knife, making the reader hyper-aware of every movement the characters make.

The phrase "Kun Family Top" has become a search engine sensation for several reasons. First, it taps into the universal anxiety of step-family integration: the fear of an unspoken hierarchy that you cannot see but can certainly feel. Second, Kaito Kun’s character subverts the typical "bully step-sibling" trope. He is not cruel for cruelty’s sake; he is cruel because he believes kindness led to his mother’s death.

Now he turned. His eyes were not angry. They were curious, which was far more terrifying.

This line has become legendary among readers, frequently quoted in forums and fan edits. It establishes Kaito not as a villain, but as an obsessive guardian of a fragile system. His "Top" status is not born of ego but of trauma. He has seen what happens when outsiders enter the Kun sphere—and he will not let it happen again.

Before dissecting Chapter 2, a brief recap is essential. "My Step Family" follows the life of , a high school student whose life is upended when their widowed parent remarries into the wealthy, enigmatic Kun Family . The Kun household is led by a stoic patriarch, but the true focus is on the three Kun siblings: the cold, distant eldest son, the rebellious middle child, and the surprisingly gentle youngest. However, there is an unspoken hierarchy within the home—a "top" that governs everything from seating at dinner to who makes major decisions.