As she bids farewell to her twenties, 30-year-old Go Sa Ri (Yoon So Hee) welcomes this new decade of her life with open arms. Leaving behind the tangled mess of her twenties, Sa Ri is ready to start over. But letting go of the past seems to be harder than she imagined. Having recently broken up with her boyfriend, Sa Ri had hoped to leave that part of her life behind. But when he unexpectedly returns, things get complicated. As if dealing with her ex weren’t confusing enough, Sa Ri begins to realize that one of her oldest friends, Pi Jung Won (Choi Won Myung), has started to develop feelings for her. As she tries to figure out her feelings for the talented artist, Sa Ri finds herself frequently crossing paths with Ki Sun Jae (Joo Woo Jae), the handsome and friendly CEO of the company where she works. Although it’s not always easy to figure out what Sun Jae is thinking, sometimes just a single glance from him is enough to make her confused heart flutter. To make matters worse, Sa Ri discovers that she has inadvertently caught the attention of Yeon Ha Rim (Kim Hyun Jin). Although he is several years younger than her, he has no qualms about expressing his feelings. Having inadvertently caught the attention of four different men, Sa Ri finds herself unsure of how to proceed. How will she find a way forward when every path seems blocked by a tangled web of emotions?