Solo Leveling: Rise of the Shadow Monarch"

Cha Hae-In's father does not appear in Solo Leveling, but if you're referring to Jin-Ho's father, Baek Yoon-Ho, he is a significant figure in the story. Here's a description:

Baek Yoon-Ho is the powerful and influential chairman of the Yoojin Construction Guild. As a wealthy and respected businessman, he cares deeply for his son, Yoo Jin-Ho, and wants him to succeed in life. Initially, he disapproves of Jin-Ho’s obsession with dungeon raids, considering it dangerous and unnecessary. However, as the story unfolds, he acknowledges Jin-Ho’s determination and growth, ultimately supporting his son's journey alongside Sung Jin-Woo.