Happy Once Again

Composer

• 
  Nam Hye Seung

Director

• 
  Kwon Sung Chang

Screenwriter

• 
  Heo Seong Hui

Main Role

• 
  Jang Na Ra

  Han Mi Mo

  Main Role
• 
  Jung Kyung Ho

  Song Soo Hyeok

  Main Role
• 
  Yoo Da In

  Baek Da Jeong

  Main Role
• 
  Kwon Yul

  Dr. Goo Hae Jun

  Main Role
• 
  Yoo In Na

  Go Dong Mi

  Main Role
• 
  Seo In Young

  Hong Ae Ran

  Main Role

Support Role

• 
  Kim Tae Hoon

  Kim Geon Hak [Da Jeon's husband]

  Support Role
• 
  Ahn Hyo Seop

  An Jung U [Dong Mi's boyfriend]

  Support Role
• 
  Ko Kyu Pil

  Na Hyeon Gi [Soo Hyuk's co-worker]

  Support Role
• 
  Park Eun Seok

  Bang Dong Bae [Ae Ran's fiancee]

  Support Role
• 
  Jang Joon Yoo

  Song Si A [Song Jae's fiancee]

  Support Role
• 
  Lee Chae Eun

  Jung A Ni [Soo Hyeok's co-worker]

  Support Role
• 
  Kim Sa Kwon

  Kim Song Jae [Mi Mo's ex-husband]

  Support Role
• 
  Choi Deok Moon

  [Su Hyeok's boss]

  Support Role
• 
  Hwang Sun Hee

  Woo Yeon Su [Hae Jun's ex-wife]

  Support Role
• 
  Kim Dan Yool

  Song Min U [Su Hyeok's son]

  Support Role
• 
  Choi Kwon Soo

  Song Su Hyeok [Young]

  Support Role
• 
  Lee Young Eun

  Han Mi Mo [Young]

  Support Role
• 
  Lee Seul Bi

  So Eun

  Support Role
• 
  Kim Ji An

  Koo Yeon Mi

  Support Role
• 
  Park Young Soo

  [Worker at Su Hyeok and Mi Mo's building]

  Support Role

Guest Role

• 
  Jin Ki Joo

  An Seon Su [Min U's mother]

  Guest Role
• 
  Sandara Park

  Koo Seul A [Former "Angels" member]

  Guest Role
• 
  Kim So Yeon

  Kim Song Hyeon (Ep. 1)

  Guest Role
• 
  Lee Dong Ha

  Kim Jung Hun [Mi Mo's boyfriend] (Ep. 1)

  Guest Role
• 
  Oh Jung Se

  [Da Jung's client] (Ep. 1)

  Guest Role
• 
  Kwak Shi Yang

  [Song Hyeon's husband] (Ep. 1)

  Guest Role
• 
  Seo Hyun Chul

  [Worker at the register office] (Ep. 1-2)

  Guest Role
• 
  Jung Ji Soon

  [Mi Mo's client] (Ep. 2)

  Guest Role
• 
  Lee Yeon Du

  [Min U's teacher] (Ep. 2)

  Guest Role
• 
  Sa Hee

  Woo Jeong Mi [Teacher] (Ep. 3)

  Guest Role
• 
  Park Hwi Soon

  [Teacher] (Ep. 3)

  Guest Role
• 
  Muzie

  [Fortune teller] (Ep. 3)

  Guest Role
• 
  Jung Dong Gyu

  [Dong Mi's boss] (Ep. 3)

  Guest Role
• 
  Jang Seo Hee

  [Dong Mi's student] (Ep. 3)

  Guest Role
• 
  Kim Hyo Seo

  [Client of the fortune teller] (Ep. 3)

  Guest Role
• 
  Kim Min Joon

  Lee Wook [Dong Mi's crush] (Ep. 3-8)

  Guest Role
• 
  Kim Ha Kyun

  [Matchmaking client] (Ep. 4)

  Guest Role
• 
  Stephanie

  Bong Bong Mi (Ep. 7)

  Guest Role
• 
  Son San

  [Lee Uk's wife] (Ep. 7)

  Guest Role
• 
  Yoon Jong Hoon

  [Dong Mi's ex-boyfriend] (Ep. 7)

  Guest Role
• 
  Baek Bong Ki

  Chun Gi

  Guest Role
• 
  Mi So Yun

  Nurse Kim

  Guest Role
• 
  Song Joon Hee

  Kim Tae Yong

  Guest Role
• 
  Seo In Sung

  Song Min U [Child]

  Guest Role
• 
  Park Geon Gyu

  [FD]

  Guest Role
• 
  Moon Se Yoon

  [Cupid]

  Guest Role
• 
  Hong Ki Joon

  [Blind date]

  Guest Role
• 
  Seo Jang Hyun

  [Classmate]

  Guest Role
• 
  Son Sung Yoon

  [Su Hyuk's date]

  Guest Role
• 
  Park Hae Mi

  [Ae Ran's mother]

  Guest Role
• 
  Shin Bi

  [Perilla leaf personality]

  Guest Role
• 
  Sazal Kim

  [Counterfeit goods dealer]

  Guest Role
• 
  Jung Young Hoon

  [Hae Jun's friend from university days]

  Guest Role
• 
  Lee Ji Hoon Guest Role
• 
  Seo Ye Hee Guest Role
• 
  Seo Han Gyeol Guest Role
• 
  Ray Yang Guest Role
• 
  Lee Chae Min Guest Role
• 
  Park Dae Kyu Guest Role

Unknown

• 
  Yoon In Jo Unknown
• 
  Bae Eun Woo Unknown
• 
  Han Dam Hee Unknown