Su Yan is a new generation of cultural relic restorer in the museum. He is good at restoring ancient paintings. He has a calm and sharp personality and is extremely sensitive to details. While restoring an orphan copy of "Jiangshan Zhenling Tu" from the Northern Song Dynasty, it was discovered that there were strange faded runes in the clouds and mist in the painting, and the repair tools frequently failed for no apparent reason, causing the temperature of the frame to fluctuate between hot and cold.