하나훈 on Twitter: "[DOWNLOAD] 150503 & 150510 MBC King of Masked Singer Ep 5 + Ep 6 - #Sungjae Cut #비투비 #BTOB #성재 http://t.co/Y7uy5wi9Xw http://t.co/W2rTLadukI"
Why Sungjae was "opted out" from King of Masked Singers | K-Pop Amino
Netizens find more proof that BTOB's Sungjae is a contestant on "King of Mask Singer"
BTOB's Yook Sungjae Breaks Idol Singing Stereotypes on “King of Mask Singer” | KissAsian
King of masked singer] 복면가왕 - Space Beauty Maetel's identity! 20160124 - YouTube
Sungjae Girang Tebak Peserta 'King of Mask Singer' Ini Member Red Velvet, Benarkah?
Netizens find more proof that BTOB's Sungjae is a contestant on "King of Mask Singer"
Masked Singer' PD Selects “Vocal Skills Top 7” Among Idols | Time-Travelling Tofu
My Top 5 performances of King of Masked Singer…so far | QT K-POP
180708 MBC - King Of Masked Singer Official photo . #BTOB_11th_THIS_IS_US #BTOB_only_one_for_me #비투비_너_없인_안_된다 #BTOB #비투비 #BornToBeat…
TVPP】Sungjae(BTOB) - Thanks, 성재(비투비) - 감사 @ King of Masked Singer - YouTube
YOOK SUNGJAE - ONE DAY LONG AGO (Masked Singer)- Yoon jong shin cover by Myint Mo Zaw
A new F4 is created with King of Masked Singer contestants Chen, L, Ken and Sungjae - Random - OneHallyu