Moment at Eighteen (TV Series)
Happiness and Sadness Come and Go Instantly (2019)
Full Cast & Crew
Cast (in credits order)
| Ong Seong-wu | ... | Choi Jun Woo (as Seong-wu Ong) | |
| Kim Hyang-gi | ... | Yoo Soo Bin (as Hyang-gi Kim) | |
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Shin Seung-ho | ... | Ma Hwi Young (as Seung-Ho Shin) |
| Kang Ki-young | ... | Oh Han Kyeol | |
| Kim Do-wan | ... | Cho Sang Hoon | |
| Moon-Bin | ... | Jung Oh Je | |
| Kim Sun-young | ... | Yoon Song Hee (as Kim Sun Young) | |
| Shim Yi-yeong | ... | Lee Yeon Woo (as Yi-yeong Shim) | |
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Park Sung-Geun | ... | Lee Guan Yong [Vice Principal] |
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Yoo In-soo | ... | Yoo Pil Sang (as In-soo Yoo) |
| Jung Young-joo | ... | Park Geum Ja | |
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Young-ji Heo | ... | Kim Ji Min |
| Rest of cast listed alphabetically: | |||
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Song Geon-hee | ... | Shin Jeong Hu (as Geon-Hee Song) |