North refers to men and south refers to women, which is a hint of lovers. This moral expresses the firm love and mutual support between two people. Thinking of the south and thinking of the north refers to the man's persistent protection of the woman, and the woman's yearning for the man expresses their deep affection and concern for each other. This moral emphasizes the tacit understanding, support and trust between lovers, and symbolizes that we face the difficulties and challenges in life together and pursue happiness and success together. Studying from north to south means romance and affection, which is suitable for couples who want to establish a stable and solid emotional foundation. Pass on a feeling of interdependence and mutual support, and let the other person feel the power and warmth of love.