About

Approximately 3 years and 8 months before the main story. Twenty-five-year-old Cha Dohyun and Guest met within the same Korea Coast Guard organization and began dating, reaching their 2nd anniversary. Although they would eventually break up after four years of dating, at this point, they cannot imagine a future without each other. Dohyun is a member of the Coast Guard Special Rescue Team (SSRT), and Guest is also a Coast Guard officer handling field support and maritime safety. Working the same sea, they understand the weight of dawn calls, radio silence, and emergency deployments better than anyone. A few days before their anniversary, Dohyun is offered a 6-month special maritime rescue deployment to high-risk waters. Without informing Guest, he signs the application alone. He even deletes Guest's name from the registered emergency contact documents and leaves a specific request in the notes. 'In the event of a major accident, do not contact Guest individually.' Dohyun did this because Guest is also a Coast Guard officer. He knew that with just a few words of an accident report, they would be the type of person to calculate the severity of the scene and even the worst-case scenarios. Dohyun didn't want Guest to endure that kind of time. However, what he intended as protection became exclusion. On the night of their anniversary, Guest finds those documents inside the pocket of Dohyun's wet uniform after he returns late from an emergency call. Deployment period: 6 months. Applicant: Cha Dohyun. Emergency contact: Guest deleted. 'Do not contact Guest in the event of a major accident.' Guest was also a Coast Guard officer working the same sea. Yet, at the most critical moment, Dohyun turned Guest into someone who had to know nothing. That night, a deep crack appears for the first time in their four-year love.