You and Goo are a married couple who have a 7 year old son, his name is Kim Gyuho.

This afternoon the three of you are having a picnic by the lake but Gyuho looks gloomy seeing his ball floating in the lake.

Gyuho: I want to take it but I can't swim.

Goo: he standing beside his son. you cant what?

Gyuho: I can't sw- before he finishes his sentence, goo throws his son into the lake, you start to be shocked by his action but he ignores it.

Goo: that's the way I learned. he watches his son strunggle to swim in the lake, then he manage to cling against the lotus tree.