Question: Who has a lead role in Ethir Neechal and has also acted in Kaaki Sattai?
Context: Kaaki Sattai (English: "Tan Uniform" ) is a 2015 Indian Tamil action masala film co-written and directed by R. S. Durai Senthilkumar and produced by Dhanush, their second collaboration after "Ethir Neechal" (2013).  The film features Sivakarthikeyan and Sri Divya in the lead roles.  The film's music was composed by Anirudh Ravichander.  The story revolves around police constable Mathimaran who wants to prove himself as a true, powerful cop by finding ways to solve issues of corruption in the law and order system in the department of police. Ethir Neechal ("Swim against the Tide") is a 2013 Tamil sports comedy film written and directed by R. S. Durai Senthilkumar, a former assistant to Vetrimaran and produced by Dhanush.  Sivakarthikeyan, Priya Anand and Nandita play lead roles.  The movie released on 1 May 2013 to highly positive reviews from critics as well as the audience. Ravichandran (died 25 July 2011) was a Malaysian Indian actor who played lead hero roles in Tamil films from 1964–1979.  He has also acted in supporting roles from 1986, and directed a few films.  He was given the title of Kalaingnar Thilagham in many of the on-screen credits of films starring him in the lead role.  He was, also, called "Puratchi Kalaignar" (Refer: Anandha Bairavi Tamil Movie Title Scene).  Before entering cine-field, during his studies in Trichy, he has acted in two dramas, namely, "AanaiyidungalAnna" and "Udhaya Suriyan".  After entering cine-field, he has acted in two dramas, namely, "Mapplley Yen Magalaik Kadhali" and "That Man from Poonthamallee".  In the drama "That man from Poonthamallee", he performed in double role and Thirumuruga Kirupanandha Variyar, who presided over the drama in Vellore, has appreciated and awarded a title "Nadaga Sigamani".  He has, also, acted in a TV Serial namely., GEE boom ba in 1986.  During his tenure of acting, his fans, journalists, movie-directors/producers have given many titles, viz., Kalai Ulaga Ilavarasar, Kalai Nilavu, Romantic Hero, Velli Vizha kathanayagan, Vannap Pada Nayagan, Evergreen Hero, Chennai MGR, Kalaignar Thilagam, Style King, Stunt Man an, Bhagdath Perazhagan, Kalai chelvan, Pudhumai Thilagam etc.  He was much affectionate with his fans. Sathish Krishnan (born 22 May 1987) is an Indian film actor working in the Tamil film industry.  He made a breakthrough portraying a role alongside Sivakarthikeyan in "Ethir Neechal" (2013). Sivakarthikeyan is an Indian film actor and playback singer best known for his Tamil films.  He began his career as a dancer and television personality at STAR Vijay, initially participating in reality shows, including the stand-up comedy show "Kalakka Povathu Yaaru" and the dance competition show "Jodi Number One".  He later went on to become a recurring host of those shows, especially the popular "Athu Ithu Ethu", and many other STAR Vijay shows for multiple seasons until shortly after he made his acting debut in "Marina" (2012), "3" (2012), and "Manam Kothi Paravai" (2012).  He went on to performing lead roles in other acclaimed films, such as "Kedi Billa Killadi Ranga" (2013), "Ethir Neechal" (2013), "Varuthapadatha Valibar Sangam" (2013), "Maan Karate" (2014), "Kaaki Sattai" (2015) "Rajini Murugan" and "Remo" (both 2016). Ethir Neechal (English: "Swim Against the Tide") is a 1968 Tamil language drama film directed by K. Balachander starring Nagesh, Jayanthi, Sowcar Janaki, R. Muthuraman and Sreekanth.  It is based on a stage play of the same name, also written by Balachander.  The film was remade in Hindi as "Lakhon Mein Ek" with Mahmood. Kodi (English: Flag ) is a 2016 Indian Tamil-language political action thriller film written and directed by R. S. Durai Senthilkumar and produced by Vetrimaaran under his banner Grass Root Film Company.  The film stars Dhanush, Trisha, Anupama Parameswaran along with S. A. Chandrasekhar and Saranya Ponvannan.  Dhanush, who produced R. S. Durai Senthilkumar's previous two films, "Ethir Neechal" and "Kakki Sattai", played dual roles for the first time.  The film's music and background score were composed by Santhosh Narayanan, the cinematography is performed by Venkatesh S.  The film was simultaneously dubbed in Telugu as "Dharmayogi", which released one day after the Tamil version.  Upon release the film opened to positive reviews from critics as well as audience praising Dhanush's and Trisha's performance.  This film was later dubbed in Hindi as "Rowdy Hero 2" by Goldmines Telefilms in 2017. Lakhon Mein Ek ("One in a lakh") is a 1971 Indian comedy-drama film directed by S.S. Balan.  The film stars Radha Saluja opposite Mehmood. This film is based on brother hood relationship between characters played by Pran and Mehmood.  The film was a remake of Tamil film "Ethir Neechal". Suza Kumar is an Indian film actress who has appeared in Tamil language films.  After making her debut in the Tamil film "Ethir Neechal" (2013), she has been seen in films including "Veeram" (2014) and "Vellikizhamai 13am Thethi" (2016). Sankaramanchi Janaki (born 12 December 1931), popularly known as Sowcar Janaki, is a south-Indian actress who has acted in over 387 Tamil, Telugu, Kannada, Hindi and Malayalam films.  She also performed on stage in over 300 shows and was a radio artist during her earlier years.  Her career as film actress began after her marriage only.  She became a popular actress with hits across languages between 1949 and 1975 as the lead heroine such as "Sowcar" (Telugu), Valayapathy, Rojulu Marayi in Telugu, then in Tamil like Naan Kanda Sorgam, Kaviya Thalavi, Bhagya Lakshmi, Pallum Pazhamum, Paar Magale Paar, Thayikku Thalaimagan, Kumudham, Panam Paadithavan, "Puthiya Paravai" , Bama Vijayam, Oli Villaku, Ethir Neechal,Maanavan, Uyardha Manidhan, Nimarundhu Nil, Thunaivan, Needhi and "Iru Kodugal" (Tamil), with Kannada films like Devakaanika, Saaku Magalu, Sadarame, Thayige Thakka Maga and then with Malayalam debut Schoolmaster (1964) and with a film in Hindi - Teen Bahuraniyan.  She worked with famous directors such as Dada Mirasee and K Balachandar.  She moved to supporting roles after 1975 and her performances in Cinema Paithiyam, Thee, Thillu Mullu, Vetri Vizha, Kaanche were widely appreciated.  She served as jury member for the National Indian Films awards committee and as chair person for state Telugu Films awards committee.
Answer: Sivakarthikeyan