Zuo Zhong and pet doctor Ling Yiming were once bitter campus rivals who were always at each other's throats. At a matchmaking event during a torrential downpour, the tip of Zuo Zhong's fountain pen pierced the disguise covering Ling Yiming's blue eyes, while Ling Yiming's glass marble revealed the old knife scar on Zuo Zhong's chest. Just as their love began to spread like wildfire, Zuo Zhong used that same pen to sign a breakup agreement. To win his family's approval, he had to build a business empire within three years. After Ling Yiming got drunk, someone set him up with a video that made it look like he had cheated. The shadow of his bipolar disorder and his sense of betrayal dragged him into an abyss. For ten years, they sank into their own personal hells.
Twelve years later, they meet again on a plane. Ling Yiming's pet shop is under siege from Zuo Zhong's business rivals, and Zuo Zhong sustains another injury to his ribs protecting him. When Ling Yiming tears open his bloodstained shirt, he finds a rose tattoo covering the old knife scar. The Morse code spells out, "Wait for me." A video recovered from a shattered phone reveals the truth about what happened back then: Zuo Zhong's sister edited the footage to make it look like Ling Yiming had cheated, while Li Lingling, the woman chosen for Zuo Zhong in an arranged marriage, used her family's power to abduct Ling Yiming.
Zuo Zhong wields his fountain pen like a blade and spills blood in the business war, while Ling Yiming uses antidepressants to help them both heal their festering old wounds. In the end, they burn proof of their hundred-billion-yuan assets. Ling Yiming closes his pet shop, and in the town of Nanfeng, where thorny roses bloom everywhere, he buries that rusted fountain pen. As the ragdoll cat "Pact" leaps over the newly planted roses, the clear sky is finally reflected in Ling Yiming's blue eyes. "The scars from those biting roses... do they still hurt?" Zuo Zhong kisses the moisture from his eyelashes. "Good. If they hurt, it means we're still alive."
