Joy used to be a talent child with many dreams and ambitions. With a creative mind, she want to invent many usedful things to make life more convenient. But in the flow of time, she is trapped between being a mother and a daughter. And the complicated four-generation family with tons of trouble inside make her feel overwhelimg and busy all the time.
Oneday, frustrated when using a conventional mop, Joy came of with an idea about self-wringing mop and desinged then built it. After a lot of difficulties in calling for investing, advertisements, the mop sells out and Joy earned thousands of dollar. 
Joy becomes a successful independent businesswoman who sponsors other inventors.