I booked a plane ticket and texted that the flight number was MU8 100. Later, I said that the actual carrier flight number was KN2602. What happened? Which flight should I take?

MU is from China Eastern Airlines, KN is from United Airlines, and KN is a subsidiary of MU. Your actual flight is the ticket of MU, but this flight (or this plane) is actually KN2602, that is, you bought the ticket of MU, but you actually took the flight of KN2602. MU8 100 is a flight with the code of * * * and the flight number of MU8 100, but the actual carrier service and on-board service are provided by KN2602. When buying tickets, please note that if it is a ticket, only the flight numbers starting with 2, 5 and 7 are Mu's own flights, and other numbers starting with * * * are generally used to enjoy other people's flights.