Two women meet in a sauna. The one, wife of an advertising creative, the other, a rock singer. The publicist, who works on sock ads, has a crazy mother. He is also crazy, by inheritance .

Dongyang TV’s intern reporter Jung-hoon takes a hidden camera for a coverage. He meets ‘Naoko’ and succeeds in getting some footage. When his superiors see his work, they compliment him and it’s determined to air. But when police calls Jung-hoon, he finds the last message from ‘Naoko’.

The story is about a woman, who has to heat up the company's sauna, because the bosses want to entertain foreign visitors. The sauna is situated in a small village where her ex-husband is from, and an old aunt of his is still living. In addition to having to face her bosses she also has to face her past.

サウナをこよなく愛する、のんびりやのくま、サクマくん。 　　サクマくんは、サ球という星に住んでいる。それも、ちょっと個性的な家族と一緒にだ。 　　ぽっかいどうサウナ大学教授のお父さん。お母さんはスナックで働いている。そして、かわいい弟のコサク。 　　一家におとずれるたいていの「難しいこと」は、いつもサウナが解決してくれる。 　　そんなある日、サクマくんは、自分だけ家族の「謎」に気づいてしまうー。