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Soo Ji's mother and Si Hyun's father make an official announcement about their engagement. Only then, do Soo Ji, Si Hyun, and Se Joo find out about the adults' relationship. Ki Young, Soo Ji's first love, makes snide remarks about the surprise announcement, and Se Joo stands up for her. Meanwhile, the three musketeers try to find a way to stop their parents from getting married.
Woo Do-hwan
Kwon Shi-Hyun
JOY
Eun Tae-Hee
Mun Ka-young
Choi Soo-Ji
Kim Min-jae
Lee Se-Joo
Shin Sung-woo
Kwon Seok-Woo
Jeon Mi-seon
Seol Young-Won
Kim Seo-hyung
Myung Mi-Ri
Jeong Ha-dam
Ko Kyung-Joo
Moon Hee-kyung
Oh Se-Ri
Lee Yeong-jin
Jung Na-Yoon
Tae Hang-ho
Priest Matteo
Oh Ha-ni
Park Hye-Jung
Hwang Jeong-min
Jo Geun-Sook
Lee Jae-kyoon
Lee Ki-Yeong
Kim Yeong-ok
Grandmother from nursing home
Kim Ah-ra
Bing Bing
Kim Jung-young
Tae Hee's aunt