Jiangnan merchant woman Su Youning carries secret military equipment ledgers to the capital to save her father. A collision on the long street bumps into the cold-faced Jing Prince An Yunchuan. Her sharp tongue and clear insight pierce his cold disguise in three sentences; his decisive and ruthless nature is repeatedly driven by her to ear-reddening and out-of-control corners of the mouth. She balances accounts to break deadlocks, while he guards her fiercely with a cold face. From the marquis estate's accounting room to the palace coup battlefield, the two pit themselves against and save each other, mastering one another mutually. The iceberg prince finally admits—My high coldness, upon meeting you, fails to balance the accounts.