[Straightforward, slow-on-the-uptake, naturally airheaded woman x outwardly cold but inwardly passionate, lovesick man + sweet romance + love grows over time + mutual firsts + everyday life]
Shen Zhi, a modern-day corporate drone, moved to the big city to escape matchmaking and became a workhorse. By chance, she found the Labrador that had wandered off from the CEO's home. The dog was devoted and loyal, and Shen Zhi became the CEO's pet sitter. She also ended up pretending to be her boss Gu Yichen's high-maintenance girlfriend to fend off pressure to marry.
Then CEO Gu Yichen was in a car accident and lost his memory. When he woke up, he saw the sweet everyday moments they'd fabricated on their phones. Combined with how terribly his family treated Shen Zhi, he concluded that they were star-crossed lovers, doomed because society wouldn't accept them. He solemnly told Shen Zhi, "Don't be afraid. Even if I've lost my memory, I'll still take responsibility for you."
Shen Zhi: "Wait, let me explain."
Gu Yichen: "Zhizhi, you've suffered so much."
Shen Zhi: "It's not what you think. Actually, we..."
He pulled her into his arms, his voice choked with emotion. "Don't say another word. I understand everything."
Shen Zhi was on the verge of tears. "What exactly do you understand?!"