For further context and proof for what I said, page back to the later half of Chapter 13. This is how much a no-name side character can influence the bigger picture if left alive to interact with the emcees long enough.

The .5 chapters of this series is just... WAY WAY SWEETER THAN ICE CREAM BOBA TEA, I'd get diabetes just from reading this.

PS: The last time I remembered feeling this level of diabetes was from Acchi Kocchi, and that was over a decade ago! Even what I felt in Netjuu no Susume and Koikimo ain't this bad!

So much drama and politics for a school that was supposed to be simply teaching dark magic... Well, not like there wasn't anyway. *glances at Harry Potter series*

The "no way" part was only when they cannot cultivate. But with the emcee, ANYONE can cultivate - that's PLOT ARMOR for you. That means anyone and everyone who sticks with the emcee can gain fortune - which is bad news for any villain.

What is the use of hostages when its sooooo obvious that the emcee only cared about the girl?

Talking about hhis OG world? Why need it when he can have almost EVERYTHING IN HIS HANDS in this world?
Allies? Duh, his subdued servants are way, way more powerful and talented than them, even his espionage ladies are top tier in power. Not to mention they don't even have Fortune Value, much less the talent to cultivate, they are just cannon fodder characters.

To be fair, none of that would have happened if that old man wasn't so self-centered.

Well, the professors' drama reaches the students on this day, much more that it's club day... any club that successfully nabs the MC is pretty much a guaranteed win, whether he joins their activity or not.

Well, I do not. If he really cared for his sister, he'd give up on everything else, including the admission to Keyzen, and rush to his sister instead of telling her to wait.

As for the father, its only typical noble behavior, the reason why his marriage to the old man's sister is because of power and fame. Without those, his sister is nothing but a burden, only good for making offsprings at best.

How would you suggest them living to be even useful to Master Gu then?

MC just became Vergil and that old man became a tentacle monster...

That's right, Master Gu gains nothing by keeping them alive, and they may bring more problems. The solution was easy, was it that hard to figure it out?

And if it was about that girl, Master Gu already killed it with her first impression of him. Will it be so easily changed by the snap of a finger?

Your last line already said it, then why would any villain leave them alive? Its not a villain's job to be fucking merciful.

Was he though? As far as I know, he is the only player who came close to the MC. Yes, he got stronger now thanks to the murim, but he got himself a death sentence by doing so - unlike the MC.

As to what that death sentence is, you'll know by either reading to my past chapters' comment (I mentioned this clearly before) or understanding the Tower's rules and regulations that was told thus far.

SHUTDOWN! TIDES ALWAYS TURN!!! - Gangplank, League of Legends

To be fair, those mortals will die anyway if they are not Fortune's Chosen, killing them now or later makes insignificant difference. But better fewer problems than more pests. Remember that the emcee will have all of them cultivate if they all survive (greater nuisance), he said it last chapter.

Considering the gun, at most 6 bullets left. More if we assume they have "magic ammo".

To that guy in the last panel, your bitch literally told you to give up your stance and surrender in a previous chapter but you didn't listen, and now you want her to beg for mercy in your stead? Not only you are ignorant of where you and your family stand in the present picture, you are even that shameless to ask an outsider girl to surrender for you instead of actually acting like a responsible man and bow your first head for just once in your life? I am cringing so hard at what a failure these emcees are coming to be, man...

Not the mention he's the next best player after the MC himself, so other players are technically just fodders before them - unless they are his friends.

Also remember, the MC used an item that TEMPORARILY unlocks the floor limitations (up to 20 above and 20 below), Alice will permanently get her powers back when she returns to her original floor.