Deadly cases of second lead syndrome!

Jiang Chen (cold) vs. Wu Bo Song (caring)

Zou An (quietly caring) vs. Shen Chen Yang (charismatic)

"Phoenix" Xufeng (reactionary) vs. "Fish Fairy" Runyu (tempered)

Goo Joon Pyo (crazy) vs. Yoon Ji Hoo (calm)

Kagaya-sensei (rogue) vs. Mochizuki-san (gentleman)

Yoo Jung (mysterious) vs. Baek In Ho (direct)

-> The reason I adore Seo Kang Joon

Han Gyul (selfish) vs. Han Seong (kind)

-> The reason I adore Lee Sun Gyun...OMG, his voice is butter!!

Sensei (forbidden) vs. Mamura-kun (accepting)

Ji Chun Xi (hurtful) vs. Dylan (helpful)

Lee Gun (hurtful) vs. Daniel (kind)

-> The reason I adore Choi Jin Hyuk

Ji Xiang Kong (immature) vs. Luo Tian (mature)

Yuri-Yuri (future weird adult) vs. Masashi (considerate) vs. Yamashita (assertive)

Sano Izumi (straight-laced) vs. Nakatsu Shuichi (entertaining)

Zhi Shu (cold) vs. Ah Jin (caring)

-> The reason I adore Wang Jiro

Irie-kun (cold) vs. Kin-chan (caring)

-> Yamada Yuki was perfect as Kinnosuke.

Hongyo (oddly adorable) vs. Hase-san (oddly vulnerable)

Thatrapee (cold) vs. King (warm)

-> Tao was perfect as King.

Khun Chin (jerkface) vs. Khun Tong (sweetheart)

Khun Sake (quarrelsome) vs. P'Poo (sweet)

Nai Din (immature) vs. Khun Phu (responsible) 

Ling Bu Yi (formidable) vs. Lou Yao (earnest)

Ling Bu Yi (turbulent) vs. Yuan Shen Juan (steady)

Li Zhong Mo (autocratic) vs. Xiang Jun (empathetic)

-> This SLS went up in volcano-sized flames! 

Tham (prickly) vs. Sia Leng (admiring)

Paat (unreasonable devil) vs. Prawut (selfish fallen angel) vs. Pootawee (cherishing angel)

Wang So (powerful) vs. Wang Jeong (safe)

Ratt (post-amnesia) vs. Dindan (pre-amnesia)

Daniel (hard) vs. Chen Ming (vulnerable)

Dal Po (closed) vs. Seo Beom Jo (open)

Baek Seung Jo (icy) vs. Bong Joon Gu (adoring)

Kin (vengeful) vs. Akk (protective)

Joo Won (nuts) vs. OSKA (nice)

Ji Seong Jun (solid) vs. Kim Shin Hyeok (funny)

Habaek (conceited) vs. Shin Hoo Ye (accessible)

Kim Tan (bold) vs. Choi Yeong Do (bully)

-> The reason I adore Kim Woo Bin

Captain (reliable) vs. Chayin (rebel)

-> The reason I adore Louis Hesse...drooool!

Pei Lin (possessive) vs. Xin Zhi (protective)

Jang Joon Hyeon (jerk) vs. Jo Geun Woo (quirky)

-> The reason I adore Shin Sung Rok

Eun Sub (wishy-washy) vs. Young Woo (direct)

-> And Young Woo was only a guest role!

Hwang Tae Kyung (harsh) vs. Kang Shin Woo (gentle)  

-> The reason I adore Yong Hwa

Night Tenjo (trainable) vs. Soushi (real)