Hyun-jin spent her whole life working hard for her sister, the one who always had her back. Then, in an instant, her sister was gone, leaving her with only one way to repay the love: raising Woo-joo. Forced to co-parent with the unreliable Tae-hyung, he starts to look different. Still, despite her such feelings, there are too many reasons she can’t let her heart speak just yet!