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The S-wave DD⁎ scattering in the isospin I=0,1 channels is studied in Nf=2 lattice QCD at mπ≈350 MeV. It is observed that the DD⁎ interaction is repulsive in the I=1 channel when the DD⁎ energy is near the DD⁎ threshold. In contrast, the DD⁎ interaction in the I=0 channel is definitely attractive in a wide range of the DD⁎ energy. This is consistent with the isospin assignment I=0 for Tcc+(3875). By analyzing the components of the DD⁎ correlation functions, it turns out that the quark diagram responsible for the different properties of I=0,1 DD⁎ interactions can be understood as the charged ρ meson exchange effect. This observation provides direct information on the internal dynamics of Tcc+(3875).