Dong Ho is suspected of having leukemia, so the doctor runs a few tests. He's diagnosed with acute lymphocytic leukemia, and everyone, including Tae Poong and Seo Jun, finds out about it. Dong Ho stays in the hospital to treat his leukemia. Tae Poong and Seo Jun both try to help Yu Jung and Dong Ho.
Lee Si-kang
Cha Seo-joon
Lee Chae-young
Han Yoo-ra
Kang Eun-tak
Lee Tae-pung / Yoo Min-hyuk
Uhm Hyun-kyung
Han Yoo-jung
Kim Jung-don
Baek Min-won
Oh Chae-eun
Dong-ho's Kindergarten Teacher
Eru
Choi Joon-seok
Yang Mi-kyung
Lee Kyung-hye
Seo Woo-jin
Han Ho-dong / Lee Min-woo
Lee Il-hwa
Yoon Su-hee / Seo Ji-sook
Chae Bin
Kang Ye-jin