A busy man, who works in office hasn't seen his mom in a while. receives a message from her telling him to be careful of the fine dust, then he looks at the portrait of his mom and him on the desk and has flashback, the flashback is his mom in the late 20’s taking care of a 7~9 y/o kid when he comes home from school. inside the house he saids that he was coughing a lot on his way back home, and he thinks he got a cold. the mom serves him food and she starts nursing the plants she has in the house and after that she tells to her son “You will not cough again” putting her hand on his back. then when he goes back to the present he thinks and says aloud “my mom always made sure that i was breathing fresh air and what i’ve done for her!?” he starts looking for a present for his mom but he says “ugh all this products are not trustworthy! they just only want to sell and don't care about the health” then he search and finds an article explaining and comparing the current products on the market that actually help to make the air cleaner. he looks at it and finds out that 3m air purifier is scientific proven that is the best option. he buys it and then he goes to his mom house, gives her the present and says to her “Now you can go anywhere you want, and do not worry about air pollution. It is easy to use. It does clean air automatically and shows when the filter should be changed.” She thanks and seems happy. Then they put it in the car and enjoy their ride.