This post was created for those of you who got confused by which K-Pop idols & celebrities have made their cameos in the series (LOL, even I got confused trying to keep up with the names myself XD). Some of them have important roles as recurring characters, but others are just famous people in the fictional 'Woollim Hollywood'.

Anyway, listed below are the celebrities (excluding the Infinite members & Woollim staff as well as their families) & which arc they made their first appearance in (or mentioned during conversations):

 

1. June

Pilot [Chapter 1-2]: 

- G-Dragon (Big Bang)

- Changmin (2AM)

- Jinwoon (2AM)

- Jaejin (F.T Island)

The Designer [Chapter 3-5]: 

- Key, Jonghyun (SHINee)

- Hyun Joong (SS501)

- Siwan (ZE:A)

- Seungyeon (KARA)

The Host [Chapter 6-10]:

- G.O (MBLAQ)

- Leeteuk (Super Junior)

- Kang Sora

- Bora (Sistar)

- T.O.P (Big Bang)

- CL (2NE1)

- Woori (Rainbow)

- Stephanie (CSJH The Grace)

- Lee Joon (MBLAQ)

- Youngwon (DMTN)

- All members of Block B

- G.NA

 

2. July

The Model [Chapter 11-15]:

- NS Yoonji

- Sandeul (B1A4)

- Hyomin, Hwayoung, Eunjung, Jiyeon (T-ara)

- Nana, Jooyeon (After School)

- Tia, Juliane (Chocolat)

- Seo Ah, Eunyoung (Brave Girls)

- Brian

- Lee Hyun (8eight)

- Kangin (Super Junior)

- Shin Min Ah

- Lee Kwangsoo

- Im Seulong (2AM)

- Doojoon, Junhyung (B2ST)

- Gayoon (4minute)

- Kim Soohyun

- Suzy (miss A)

- Victoria (f(x))

- Hongki, Jonghoon (F.T Island)

- Minhyun (NU'EST)

- Misung (Sunny Hill)

- Narsha (Brown Eyed Girls)

- Baek Ji Young

- Sohee, Yoobin (Wonder Girls)

The Heir [Chapter 16-28]:

- Shin Se Kyung

- Junho, Taecyeon (2PM)

- Hanbyul (LED Apple)

- Minah (Girls' Day)

- Kim Bum

- Chorong (A Pink)

- Shin Jung Hwan

- Sung Shi Kyung

- Yoochun (JYJ)

 

3. August

The Rocker [Chapter 29-34]:

- Heechul (Super Junior)

- Jungmo (TRAX)

- Noh Min Woo

- Jang Geun Suk

- Niel (Teen Top)

- Hara, Jiyoung (KARA)

- Yunho (DBSK)

- Jaejoong (JYJ)

- Lee Kwanghaeng

- Hyewon (Co-ed)

- Jihyuk (Supernova)

- Bomi (A Pink)

- Krystal, Sulli (f(x))

- Janey (GP Basic)

The Idol [Chapter 35-46]:

- Jung Min (SS501)

- Taeyeon, Tiffany, Seohyun (SNSD)

- Kim Jong Kook

- HaHa

- Gary (LeeSsang)

 

4. September

The Actress [Chapter 47-54]:

- Jiyeon (T-ara)

- Geonil (Supernova)

- Yoo Seungho

- Nam Gyuri (SeeYa)

- JYP

- Go Ara

- Jaekyung (Rainbow)

- Eunkwang (BtoB)

- Son Ho Young (g.o.d)

- Luna (f(x))

The Doctor [Chapter 55-63]

- Ji Hyun Woo

- Hyosung (Secret)

- Song Joongki

- Song Jihyo

- Goo Hyesun

- Park Jungmin

- BoA

- Son Dam Bi

- Himchan (B.A.P)

- Horan (Clazziquai)

- Lee Da Hae

- Baro (B1A4)

 

5. October

The Rapper [Chapter 64-74]:

- Simon D

- Min (miss A)

- Yonghwa (CNBLUE)

- Lizzy (After School)

- Minhwan, Seunghyun (F.T Island)

- Cho PD

- Loptimist

- Verbal Jint

- Hanhae (Phantom)

- Changseob, Hyunshik, Ilhoon (BtoB)

- Junsu (JYJ)

- Yooyoung (Hello Venus)

- Gilme (Clover)

- Kris (EXO-M)

- Teddy (1TYM)

- Beenzino

- MC Sniper

- DJ Tukutz (Epik High)

- Dok2

- Bizzy (MFBTY)

- Dumbfounded

- The Quiett

- Jihyun (4minute)

- Chakun (Electroboyz)

- Janghyun (Sunny Hill)

- Kim BoA (SPICA)

The Comedian [Chapter 75-90]:

- Jay Park

- Kim Giri

- Seo Taehoon

- Song Byeongchul

- Kim Jimin

- Kim Sooro

- Shin Bora

- Baek Chan (8eight)

- Hayana (EvoL)

- Dasom (Sistar)

- Daehyun (B.A.P)

- Taemin (SHINee)

- Aron (NU'EST)

- Choiza

- Sleepy (Untouchable)

- Maboos (Electroboyz)

- Sangchu (Mighty Mouth)

- Kangnam (M.I.B)

- Fei (miss A)

- Ye Eun (Wonder Girls)

- Seo In Young

- Eric (Shinhwa)

- Hyoyoung (Co-ed)

- Youngjae (B.A.P)

- Sooyoung (SNSD)

- Siwon (Super Junior)

- Zelo (B.A.P)

- ZUNO

- Kang Ji Hwan

- Sehun (EXO)

- Seyong (MYNAME)

- Kim Kiyeol

- J-Da (EvoL)

- Yang Seonil

- Kim Younghee

- Kim Junho

- Yeonkyung (The SeeYa)

6. November

The Producer [Chapter 91-?]:

- Ga In (Brown Eyed Girls)

- Park Jung Ah

- Jo Kwon (2AM)

- Lee Soo Man

- Yang Hyun Suk

- Kim Tae Hee

- Sojin (Girl's Day)

 

Phew! That's everyone, I think... Lemme know if I made any mistakes XDD

I'll continue adding to this list as the series goes on ^^