They are childhood sweethearts. Something happened that caused them to become estranged. He saw her indifference towards him, but he guarded her without hesitation and watched her silently.
That year, she left. Went to a strange city. He's not there.
After several years, they reunited. The barriers slowly disappeared.
With the appearance of another man, have they missed each other, or...
Gu Yunruo: We didn't get through the seven-year itch.
Mo Yaxi: We will survive the seven-year itch until it comes to an end. I love you and will accompany you to the end for seven years.