Disaster Strikes, and I Have a Tower Defense System

[The apocalypse has arrived. Congratulations, Host, you've bound yourself to the Tower Defense System.] A map appeared before Jian Yu, dotted with red points representing enemies and blue points representing humans. [Please place your turrets.] [Enemy defeated. Gold +2.] [Upgrade Artillery Turret Lv. 1 to Lv. 2 for 10 gold? Health +10, damage +1, attack range +1. Confirm?] [The Tower Defense System provides utility bill payment services for the Host: electricity costs 2 gold per kilowatt-hour, water costs 10 gold per ton, and gas costs 8 gold per cubic meter. Appliances can be upgraded for a fee based on difficulty.] [The monthly shop has been updated. Your favorite snacks, potato chips and cola, are now in stock.] [New item available: land deed. Use it to obtain a house that comes with the land.] Jian Yu set up turrets, killed zombies to earn gold, upgraded her turrets, and bought items from the System shop. Holed up in her safe house with supplies stocked, she was convinced she was about to become invincible! Jian Yu's second novel: "I Use My Tower Defense System to Send Clones Across the Myriad Worlds" After transmigrating back to her own world, Jian Yu took a job at her parents' request, using her abilities to land a cushy position where she could coast along for a paycheck. The kind of job where you read the paper and drink tea at work, and when something comes up, you say, "That's not my department. You should ask so-and-so," or, "I see. I'll have to get approval from my supervisor." Anyone looking at her would think she was an extreme slacker who got the job through a relative's connections. But outside of work, Bound to the Tower Defense System, she held a stack of coordinates to other worlds. Jian Yu: Which world should I explore today? Coming soon: "I Transmigrated into a Game Character and Got Bound to an Idol System" [Congratulations, Host! You've bound yourself to the Idol System. From today onward, work hard to become the world's number one idol!] Taken by itself, that didn't sound like anything was wrong. But Shen Hui had transmigrated into the body of a game character, and the game she came from had nothing to do with idols. Shen Hui: ... [Host profile: Stage name: Lilith (the character's name in the game) Looks: E Singing: E Dancing: E Chatting: E] [Congratulations, Host! You've entered the talent show "Set Off" (the name of the game).] [After comprehensive analysis, the Host's chances of debuting are 0%.] [Solution: Purchase a Korean plastic surgery package to improve your looks.] Shen Hui: How can a paper character get plastic surgery? System: Have an elite illustrator redraw your character portrait. Shen Hui: ??? There's something wrong with you! Theme: Better safe than sorry