For lovers in love, they want to stick together every minute, but a military enlistment order dropped from the sky, forcing these four girls to temporarily lose their boyfriends for nearly 730 days. Four pairs of men and women, four different relationship statuses, all changed more or less because of this military service. Yuanzai (played by Jang Keun Suk) and Xiaozhen (played by Sun Taiying) are a pair of lovers with an age difference. One is a younger brother who has not yet gotten rid of his childishness, and the other is a mature woman in her thirties. The love that is not favored by outsiders still comes quietly. The arrival of military service has buried the explosive factor for this already dangerous love, but it is also the power to move forward; Eun Suk and Zhenya (played by Liu Renying) are a pair of sweet and mushy lovers, but the military enlistment order dropped from the sky; Baolan (played by Zhang Xizhen) is an outsider in a state of unrequited love. Through Minzhe's military service, can she express what she thinks in her heart? Feiyang, who can't stand the loneliness, has changed countless boyfriends, but can she find her only one this time...