Happiness is to be good at discovering those small "gifts" in a life of constant repetitive movements. Even if they are insignificant at first, they can soothe people's hearts at a certain moment.
An Qin thought that after the throbbing at that moment, there would be no more. She lived her small life with peace of mind, looking for the 'gifts' that life gave every day, and enjoying her own happiness that may be small but pleasant enough.
Until life gave her a huge 'surprise'.