Smoke

Bora sighed, tears streaming down her face as she signed the document. She turned her head away as Siyeon made a decision to take care of their adopted son, Phil, by herself.
Devastated and ashamed, Bora packed up and left Siyeon's household in frustrated tears which led to her homeless life.

Meanwhile Siyeon met a woman named Yoohyeon and was soon engaged to her and after a while, she moved in with Siyeon in her now upgraded household with Phil.
Phil misses Bora deeply, and Yoohyeon coincidentally came across the said woman and sincerely offered her help.

But Siyeon had other plans.