From the first sight, Hyeon Jin and Tae Hyeong mistake each other for the worst, never expecting to meet again, let alone become in-laws. After a tragic accident leaves their nephew U Ju (meaning 'Universe' in Korean) orphaned, Hyeon Jin and Tae Hyeong are left with no choice but to care for him together. Thrown into unfamiliar roles as co-parents, these two different, imperfect adults struggle to navigate not only childcare but also life and love-while slowly beginning to orbit each other.Seon Tae Hyeong is a photographer who finds comfort in the things he can control-his space, his taste, his rules. But as his brother passed away, leaving behind his child, U Ju, Tae Hyeong ends up raising him with his sister-in-law. Just as their co-parenting starts to settle, he begins to fall for her... unexpectedly and irreversibly.Woo Hyeon 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 U Ju. Forced to co-parent with the unreliable Tae Hyeong, he starts to look different. Still, despite her such feelings, there are too many reasons she can't let her heart speak just yet!(Source: CJ ENM)