To cancel the engagement arranged by his elders, Lu Chen brought the husky Er He down the mountain to the Shen family, but unexpectedly got involved in the crisis of the Shen Group's Linghu biomedical project. As patient accidents, old experiment records, and the past of the older generation are uncovered again, Lu Chen and Shen Qingxue join hands to investigate the truth and discover the secret of the seventh code that has been misunderstood for many years. Through repeated rescues and breaking deadlocks, the two gradually change their views on each other. After the crisis ends, although the engagement is ready to be cancelled, Er He brings new possibilities to their relationship.