Question

Yes

Can you spoil me a bit abojt the substitute part. How did MC become his own substitute? Did ML think MC died or some thing and found a lookalike?b

Yes, it's true that ML lost his memory since the tragedy that happened to him and MC.ML thinks that MC died while helping him, and continues to feel guilty. But it turns out that MC did not die and survived, then he worked as ML's secretary.The mistake that MC made was that he was not honest with ML, MC thought that if he continued to be with ML, one day ML would remember him. But that never happened ,because MC, even though he is an omega, doesn't emit any pheromones at all,Besides that, ML lost his memory due to the severe trauma that occurred as a result of an incident when they were still children.And all is made worse by the families of both parties, who lie to ML that MC has been dead since the incident.
But because MC really likes ML and wants to be by his side, he ends up becoming someone that ML really misses (even though it's actually the real MC).To the point where MC gets pregnant and ML finds out the real truth