I get that MC is supposed to be strong, stronger than maybe even Gods, but suddenly a training arc while he is young along with the previous tropes of having two fiancee, how would no one have searched for him? The author has made a huge big in logic, and despite saying 1 year = 1 day, and the character has been here for 4 equivalent days, still him being a child would have been reported and searched for. Another thing is, he has physically aged 4 years, which would be a unexpected thing when he returns without de-aging. This chapter and the previous really went through some shit level ex-machina.