Spark

Na In-woo

as

Yoon Ga On

Nam Bo-ra

as

Son Ha Neul

Yeo One

as

Ji Seung

Joo Ah-reum

as

Won Jae Kyung

Park Jin-joo

as

Yang Jin Soon

Kwon Eun-soo

as

Gong Ah Reum

Kim Ki-doo

as

Bong Soo

Bae Ki-sung

as

Heo Joon Il

Kim Jin-geun

as

[Son Ha Neul's...