紅潮: blush / 高潮: be at high tide / 高調: have a high tone; be in high spirits

(chiefly Internet slang) thinking with common sense

riddle; enigma

the Four Gentlemen: ume (the plum blossom, symbolising winter), ran (the orchid, symbolizing spring), matsu, (the bamboo, symbolizing summer), and kiku (chrysanthemum, symbolizing autumn):