Princess Sui'an's scheduled marriage to the consort is deliberately swapped by someone, leading her to mistakenly marry the seemingly idle Shangguan Chen. Despite initial barriers upon meeting, the two consistently tolerate each other and join hands to see through various misunderstandings in the palace. They do not chase after power struggles, but single-mindedly protect the young Third Prince, treat every kind person around them well, and resolve various storms. Understanding and supporting each other, making sincere and close friends, smoothing over all regrets around them, they guard a gentle, stable, harmonious, and happy daily life amidst the deep palace and the worldly warmth of noble families.