Because This Is My First Life

Jung So-Min

Yoon Ji-ho

Lee Min-ki

Nam Se Hee

Esom

Woo Soo-ji

Byeong-eun Park

Ma Sang Goo

Kim Ga-eun

Yang Ho-rang

Kim Min-Suk

Shim Won-seok

Kim Byeong-Ok

Yoon Jong-soo

Bo-mi Yoon

Yoon Bo-mi

Min-kyu Kim

Yeon Bok-nam

Kim Sun-young

Kim Hyeon-ja

Eung-soo Kim

Nam Hee-bong

Hee-kyung Moon

Jo Myeong-ja

Chung-Ah Lee

Go Jung Min [Se Hee's ex-girlfriend]

Jeon Hye-won

Lee Eun Sol [Ji Ho's sister in law]

Son Sung-yoon

Customized inner wear tailor

Chae Kyung Lee

Furniture saleswoman

Ye-ryeong Kim

Se-hee's aunt