The perfect babysitter, Han-gyeom, appears in front of Da-eun, a single mother who works hard to raise her chic and quirky seven-year-old son, Eun-hu.

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With his warm appearance, friendly personality, and ability, he naturally fits into the mother and son's daily life and soon becomes indispensable.

​Da-eun is grateful for the peaceful every day he gives her, but she is confused by unfamiliar excitement.......

“What are you doing with uncle?”

“...... nothing."