Douluo Dalu 2: The True God King - Chapter 28: [DD2]:

Yang Feng somehow transmigrated into a different world and received a legacy of an ‘ancient high tech’ family, which does not directly raise his power, but gives him the technology to build things which are way more advanced than the seemingly medieval world.

The Apocalypse is in full swing. Defiled - powerful creatures corrupted by the Great Collision - prowled the lands in search of prey. Unfortunately for them, the human race had long since retreated behind the secure walls of the Sanctuary of Everlast. During one of his regular excursions outside the Sanctuary, Alden is separated from Celeste. - his childhood friend and crush. In that moment, he came to regret never summoning the courage to confess. Somehow managing to survive thanks to some trickery, Alden awakens as a mage. Instead of receiving a normal power, he gains the ability to decay. What’s more, during his ascension, he received a vision from his future self advising him not to trust the Asterons - celestial beings who had saved his race from inescapable doom. Normally... such a revelation wouldn’t faze Alden. However, there was only one major problem with the declaration, though. Celeste was bound with an Asteron. And not just any normal Asteron... She had made a pact with one of the Divine Sovereigns.

The big guy dresses up as a lonely and old male supporting character, slaps his face and abuses scumbags to fall in love.
small world:
A scumbag male supporting actor who is lonely and old: learning to love with both hands.
The tyrant male supporting role who left the inheritance to the heroine’s son: the family has the throne to inherit.
The deposed prince: what kind of emperor, when the emperor!
Bingshan ex-husband of a book girl: It is impossible to chase after a wife.
The prince of the enemy country who retreated for the heroine: step on the capital and rule the world.
The pet girl mad demon of the group pet text: I pet myself.
Edible Guide: Quickly cross the routine, capitalize the romance! One cp in one world, if you change the world, your feelings will be eliminated. If you don’t like it, don’t enter. 

Content tags: face slap
Search keywords: Protagonist: Dongchen ┃ Supporting role: My concluding article “The Male Protagonist Doesn’t Follow the Plot [Quick Pass]” “Someone Wants to Take My Gold Finger [Quick Pass]” ┃Others:

- Description from novelbuddy

“201th, 202nd…”Zhou Can, an Intern of Tu Ya Hospital, a Grade A Provincial Tertiary Hospital, would silently count every stitch he finished.His target today was to complete 300 stitches and fight for a place in the House Officer recruitment two days later.[Congratulations on completing your 100,000th suture and triggering the EXP system. Medical skills and surgery practice can be obtained.]Zhou Can shook his head hard.What the hell is this?Something even more magical happened as he thought about it.An interface appeared in front of him.[Zhou Can, Intern.][Pathology Diagnosis, Level Two. Current EXP: 89.5/100. Outstanding House Officer-level diagnosis ability.]A surgical legend was in the making.