Shaun struggles to accommodate the newest member of his surgical team, Charlie, who interferes in a patient's relationship with his daughter; Park tackles a tricky brain tumor; Lea and Morgan adjust to motherhood.

Shaun and Lea struggle to balance their parental duties with their personal lives. Meanwhile, Park and Morgan try to find the time and space to reignite their romance amidst the demands of parenthood and work, and Lim's mother makes a surprise visit.