Heat and Run manga summary: âRo Jaehoâ and âJoo Ianâ are the sons of Alpha families who are sworn enemies. However, their little brothers âJoo Jihwanâ and âRo Mihoâ are in a relationshipâŚ? Ian joins Miho and Jihwanâs holiday in America and meets Jaeho there by chance. There is a strange tension in the air between the two older brothers⌠âJoo Ian, you⌠You didnât use to smell like that before!â