Mainly Focusing on Short Story Collections

They are all short stories! [1] How should a killer survive after traveling through time and discovering that times have changed? Ruthless killer attacks x appearance association boss [2] The protagonist who is always being attacked doesn't want to fall in love Narcissistic singer attacks x high-dimensional creature 3What's wrong with joining the entertainment industry if I have maxed out my stealth skills? Renwaigongxgongzhushou Purpose: Pursuing socialist core values