The central narrative arc shifts in the second half from wellness conditioning to corporate succession, hidden mortality, and sacrifice:
- The Secret Identity Reveal: Joo-eun discovers that her strict personal trainer is Kim Young-ho, the elusive heir to Gahong Group, causing temporary friction before she chooses to support his corporate duties.
- The Climactic Crash (Episode 13): Executive Choi, bitter over his family being sidelined within Gahong, plans an intentional vehicular collision aimed at Joon-sung. Young-ho intercepts the crash with his own vehicle to save his protégé, suffering compound fractures and near-fatal injuries.
- Rehabilitation and Separation (Episodes 14–15): Refusing to let Joo-eun witness his agonizing physical therapy, Young-ho relocates to the United States. Joo-eun leaves post-it notes and video messages to encourage him across the ocean until Young-ho walks again and returns on Christmas Eve.
- The Resolution & Double Pregnancy (Episode 16): Young-ho's grandmother grants full approval to their union. Young-ho proposes with a ring concealed within an unraveling ball of pink yarn. In the finale, Joo-eun discovers she is pregnant with twins and cheerfully resumes her conditioning routines alongside Young-ho.