[Quick Transmigration] The Man Behind the Supporting Female Character

Cannon-fodder supporting heroines, evil supporting heroines, backup supporting heroines, assisting supporting heroines, harem supporting heroines... No matter how wonderful the supporting heroine is, she still has to make way for the protagonist! Born from the resentment of countless readers, the System selected a certain big shot after careful screening. Come on! As the man behind a supporting heroine, protect her, support her, encourage her, guide her, and help her move forward! [User Guide] 1. The male lead may or may not end up with the supporting heroine. 2. The male lead is born into each world as a baby and lives there until he dies. 3. The System can only travel through time and space. That's all. 4. Some supporting heroines are good and some are bad. The original protagonists can be good or bad, too. 5. No vilification or whitewashing. The story stays objective, with no everyone-loves-him trope or Mary Sue, and the characters have normal values. Planned worlds: 1. Fictional medieval setting (cannon-fodder supporting heroine who came into sudden wealth) (in progress...) 2. Fictional modern city (ruthless, evil supporting heroine) 3. Fictional medieval setting (saintly backup supporting heroine) 4. Fictional modern supernatural setting (arrogant assisting supporting heroine) (More to be added...)