The result of her complicated relationship with Do-yoon, her unrequited first love, and her friends. Yejun, who always thought she was a beta, unexpectedly found herself in a heat cycle, resulting in the birth of her child five years ago in college. Returning to Korea, Yejun decides to take sole responsibility for raising her son in secret, keeping the truth a secret from Do-yoon. Five years later, however, Yejun crosses paths with the father of her child, meeting him at work – a long-overdue meeting she had hoped to postpone for as long as possible.
