A City is ruled by four great families: the Lu, Gu, Song, and Ji families, who control the city's commercial lifelines and cultural heritage.
Lu Yan is the second son of the Lu family and a freshman in the architecture program at A University. At 185 centimeters tall, sunny and outgoing, he's the center of attention wherever he goes.
Gu Yan is the eldest grandson of the Gu family and a third-year architecture student at A University. At 183 centimeters, cool and reserved, he's the campus's universally adored “white moonlight.”
Two people from equally privileged backgrounds but with completely different personalities meet in Room 402, Building 7, at A University's Bauhinia Apartments.
Lu Yan falls for Gu Yan at first sight.
What Lu Yan doesn't know is that Gu Yan saw him long ago.
At an architecture summer camp three years earlier, Gu Yan saw a boy holding an umbrella over a stray cat in the pouring rain. He remembered that scene for three whole years.
When the sunny, cheerful ray of sunshine meets the cool, gentle white moonlight, everyone thinks Gu Yan is out of reach, only to discover that he gave his heart to someone named Lu Yan long ago.
The sycamore leaves at A University turn green, then yellow, while the ginkgo leaves fall and grow again.
The door to Room 402 once went from two people to two people.
