In 1977, on a snowy night in the Great Northern Wilderness, two educated youths signed a calm and clear marriage agreement in order to obtain a place to return to the city. Xu Zhiwei wants to escape from this land, and Chen Shanhe needs a place to stay. Back in crowded Shanghai, they became the most familiar strangers living in a pavilion, carefully playing the role of husband and wife in the gap between their tight lives and their families. From working together to make a living by setting up stalls, to seizing opportunities side by side in the wave of reform and opening up, and enduring the ups and downs together. When the crisis of survival gradually passed, the agreement that began with calculations quietly deteriorated amidst the day-to-day fireworks and mutual support. At that time, the emotional waves of the past and the choices at the crossroads of the times hit again. They must see clearly whether what stands between them is cold terms or an undeclared love that has been deeply rooted in the years.