Question: How did Dunkin' Donuts, a global donut company and coffeehouse, help propell Japanese actor and model Ryohei Otani into Korean entertainment in 2003?
Context: Harry Winokur created the Mister Donut chain of doughnut shops.  The chain grew to include 550 shops before being bought out by the parent company of Dunkin' Donuts in 1990.  He was awarded the Horatio Alger Award in 1965. Ryohei Yamamoto (山本 領平 , Yamamoto Ryōhei ) , born December 30, 1974 in Kyoto) is a Japanese R&B singer, also known as just Ryohei.  He debuted as "山本領平" (written in kanji) under Warner Music Japan on 2003 with single "Almost There".  Prior to that, on November 2002, he was featured on a track "Why Not?"  by Fantastic Plastic Machine.  In 2006 he shortened his name to just "Ryohei" (written in Roman letters) and transferred to the label Rhythm Zone.  He is known for his collaborations with m-flo, being featured on tracks such as "Miss You" and "Summer Time Love". Michael Vale (June 28, 1922 – December 24, 2005) was an American character actor famous for being the longtime sleepy-eyed mascot "Fred the Baker" for donut chain Dunkin' Donuts, with his famous catchphrase "Time to make the donuts."  He was featured for 15 years until he retired in 1997, having done more than 1,300 television commercials. Vale also reprised the role for commercials for the short-lived Dunkin' Donuts Cereal.  He died of complications from diabetes at age 83 in Manhattan at New York-Presbyterian Hospital, and was cremated. Mister Donut (ミスタードーナツ , Misutā Dōnatsu ) is a fast food franchise founded in the United States in 1956 and now headquartered in Japan, where it has more than 1,300 stores.  The primary offerings include doughnuts, coffee, muffins and pastries.  After being acquired by Allied Lyons in 1990, most North American stores became Dunkin' Donuts.  Mister Donut also maintains a presence in Taiwan, South Korea, Mainland China, Philippines, Thailand, and El Salvador. Dunkin' Donuts is an American global donut company and coffeehouse based in Canton, Massachusetts, in Greater Boston.  It was founded in 1950 by William Rosenberg in Quincy, Massachusetts.  Since its founding, the company has grown to become one of the largest coffee and baked goods chains in the world, with more than 12,000 restaurants in 36 countries.  The chain's products include donuts, bagels, other baked goods, and a wide variety of hot and iced beverages. Ryohei Odai (小田井 涼平 , Odai Ryōhei , born February 23, 1971 in Konohana-ku, Osaka and raised in Kawanishi, Hyogo) , otherwise known by his mononym Ryohei (涼平 , Ryōhei ) , is a Japanese actor and voice actor probably best known for providing the voice of Orga Sabnak in "Gundam Seed" and portraying Shuichi Kitaoka/Kamen Rider Zolda in "Kamen Rider Ryuki". Shinjiro Otani (大谷晋二郎 , Otani Shinjiro , born July 21, 1972) is a Japanese professional wrestler contracted to Pro Wrestling Zero1.  Otani is also the acting President of the company. Ryohei Otani (大谷 亮平 , Ōtani Ryōhei , born October 1, 1980) is a Japanese actor and model.  He began his modeling career in Japan, then entered Korean entertainment by being featured in a commercial for Dunkin' Donuts in 2003, followed by Hyundai Motors, Olympus and SK Telecom.  His popularity helped him land roles on television, beginning with the 2006 sitcom "Soulmate".  Otani's acting career continued to be active in South Korea, starring in television dramas such as "The Road Home", "Dear My Sister", "Hero", and "The Chaser", as well as the period blockbusters "War of the Arrows" and "". A tiger tail donut (also called tiger tail doughnut or simply tiger tail) is a donut that is twisted with another ingredient so that it looks like the tail of a tiger.  This other ingredient may vary; examples include chocolate; chocolate-flavoured dough; a combination of chocolate and cinnamon; and a combination of cinnamon, apples, and coconut.  The tiger tail is the second most popular donut at The Donut Man in Glendora, California, United States, surpassed only by the shop's signature donut: the strawberry donut.  In 2010, Dunkin' Donuts locations in Kuala Lumpur, Malaysia sold tiger tails to celebrate the Year of the Tiger.  Erin Allday of "The Press Democrat" called the tiger tail the "most unusual donut" at the Donut Hut in Santa Rosa, California. The Road Home () is a South Korean daily drama starring Lee Sang-woo, Jang Shin-young, Shim Hyung-tak, Jo Yeo-jeong, Park Hye-won and Ryohei Otani.  It aired on KBS1 from January 12 to June 26, 2009 on Mondays to Fridays at 20:25 for 120 episodes.
Answer: a commercial