: Dae-ho's adoptive sisters. Mia maintains a close, supportive relationship with him, while Soo-ah's dynamic is more complex and initially distant.

: Includes neighbors and friends' family members, such as Seol-hee and Joo-hee, who further complicate Dae-ho's expanding "harem". Why "Secret Class" Stands Out Secret Class: An Honest Review - ToonGod

: The matriarch who initiates Dae-ho’s "education".

Discovering "Secret Class": A Deep Dive into the Popular Adult Manhwa

: The central protagonist. Often described as athletic and physically capable but socially and romantically stunted.

: Upon realizing his naivety, his adoptive aunt ( Eun-ae ) and sisters ( Mia and Soo-ah ) decide to take matters into their own hands, providing him with a "secret class" to help him navigate adulthood.