I Regressed to Live Properly but Became an Omega (Side Story)

Yang Jae-gu, the loyal dog of Han Seong-cheol of the Daeyoung Group. After a lifetime of toiling, he finally thought he had escaped... "You've worked hard, Jae-gu. You were a stupid but diligent son of a bitch. Farewell." He was cruelly abandoned in scorching flames, along with Park Gwang-cheol, his cherished younger brother and another heir to the Daeyoung Group. If only he could live just one more time... he would live properly for you, not Han Seong-cheol. The moment his vision turned crimson with regret, "Why is Jae-gu hyung here?" He became Yang Jae-gu, an eighteen-year-old high school student! There is only one goal in this life: To dedicate the Daeyoung Group to Park Gwang-cheol a...