While under the cover identity "Murong Yan," the crown prince became smitten with the palace guard, Gu Lang, after a fated encounter. The two had to part ways after "Murong Yan" died, but the crown prince couldn't resist trying to get close to his beloved once again... this time under a different cover identity.

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When Murong Yan "died", his subordinates told him that his sweetheart cried at his grave everyday.
In a rush, he secretly went to have a peek. However, he found out that his sweetheart wasn't crying, but was standing silently in front of his grave.
Feeling aggrieved, he decided to test his sweetheart.
Murong Yan : You visit him everyday, is it because you miss him?
Sweetheart : I'm here to see how tall the grass has grown around his grave.
Murong Yan : ......

Note: Based on a novel with its original name being 心上人来看我的坟头草 (My Beloved Visits My Grave)